User:Wavelength/Articles userfied/List of environmental topics/C


 * C

The items listed on this page form part of the multi-page list of environment topics.

This is a list of topics related (in whole or in part) to (a) phenomena in the natural environment which have a definite or significantly possible connection with human activity or (b) features of human activity which have a definite or significantly possible connection with the natural environment, even if the connection is made indirectly through the built environment. For example, hamster has been included because the effect on the built environment can affect the natural environment. Also, factory farming (often practiced indoors) has been associated with epidemics, which do not stay indoors.

The connections can be positive (even remedial) or negative or both. Some introduced species intended to benefit the ecosystem have acted as invasive species, damaging the ecosystem. Also, different sources of energy development have both pros and cons. Furthermore, an environmental topic can be such for multiple reasons at one time, as in the case of resource extraction and processing; commodity distribution, use, and misuse; and waste management.

Contents: C-Cak | Cal | Cam | Can-Canadh | Canadi | Canadj-Canadz | Canae-Canaz | Canb-Canz | Cao-Caq | Car-Cara | Carb | Carc-Carz | Cas | Cat-Cata | Catb-Catz | Cau-Caz | Cb-Cd | Ce-Cem | Cen | Ceo-Cez | Cf-Cg | Ch-Cha | Chb-Chd | Che-Chel | Chem | Chen-Chez | Chf-Chh | Chi-Chim | Chin | Chio-Chiz | Chj-Chq | Chr-Chz | Ci-Cis | Cit-Ciz | Cj-Ck | Cl-Cld | Cle-Clh | Cli-Clil | Clim-Clima | Climb-Climz | Clin-Cliz | Clj-Cln | Clo | Clp-Clz | Cm-Cn | Co-Coa | Cob-Cok | Col-Coln | Colo-Colz | Com-Coml | Comm-Commt | Commu-Commz | Comn-Como | Comp | Comq-Comz | Con-Conr | Cons-Conse | Consf-Consz | Cont | Conu | Conv-Conz | Coo | Cop-Coq | Cor-Corm | Corn-Corz | Cos-Cot | Cou-Coz | Cp-Cq | Cr-Crm | Crn-Cru | Crv-Crz | Cs-Ct | Cu-Cum | Cun-Cuz | Cv-Cx | Cy-Cz

C-Cak

 * cabbage worm (larva of any of three species of lepidopteran) (crop pest)
 * cabin cycle (vehicle)
 * cable transport
 * cacophony
 * cactus plugging ("saguaro ... species is endangered")
 * (cadaver: see) body
 * cadmium (see under Precautions)
 * cadmium poisoning
 * (cadmium-nickel battery) nickel-cadmium battery (NiCd) (NiCad)
 * caesium (cesium) (see under Precautions)
 * cage (enclosure)
 * cairn
 * Cairo-Haifa train bombings 1948
 * caisson (engineering)
 * (caisson disease) decompression sickness (DCS) (diver's disease) (the bends)
 * cake (firework) (candle barrage)

Cal

 * calcareous grassland (alkaline grassland)
 * calcicolous grasslands in the British National Vegetation Classification system
 * calcifugous grasslands and montane communities in the British National Vegetation Classification system
 * calculating local time
 * Caledonian Forest (in Scotland in the UK) (greatly reduced)
 * California Air Resources Board
 * California Aqueduct
 * California Aqueduct bikeway
 * California Bighorn Sheep ("an endangered species")
 * California Certified Organic Farmers (CCOF)
 * California Coastal Conservancy
 * California Coastal Trail
 * California Conservation Corps (CCC)
 * California Debris Commission
 * California Department of Parks and Recreation
 * California Department of Toxic Substances Control (DTSC)
 * California Department of Transportation
 * California Department of Water Resources
 * California Drivers Handbook
 * California earthquakes of June 2005
 * California electricity crisis (of 2000 and 2001)
 * California Energy Resources Conservation and Development Commission
 * California Environmental Quality Act (CEQA)
 * California Fuel Cell Partnership
 * California Geological Survey
 * California Gold Rush
 * California Green Archives
 * California High Speed Rail
 * California Highway Patrol (CHP)
 * (California highways: see) list of California state routes
 * (California hurricanes: see) list of California hurricanes
 * California mixed evergreen forest
 * California Proposition 50 (2002) (regarding water projects)
 * California Proposition 51 (2002) (regarding transportation)
 * California Proposition 53 (2003) (regarding infrastructure)
 * California Proposition 65 (1986) (regarding toxins)
 * California Public Interest Research Group (CALPIRG) (involving issues including the environment)
 * California State Route 85 (between Mountain View and southern San Jose)
 * California Trail
 * California Vehicle Code - Bicycle Relevant Sections
 * California Water Wars
 * California Waterfowl Association
 * Callendar effect (in global warming)
 * Calnev Pipeline (from California to Nevada in the US)

Cam

 * camouflage
 * CAMBIA (Center for the Application of Molecular Biology to International Agriculture) (in Australia)
 * Campaign against Climate Change (CCC) (CaCC) (in the UK)
 * Campaign Against Marijuana Planting (CAMP) (in California in the US)
 * Campaign for Dark Skies (CfDS) (in the UK)
 * Campaign for Nuclear Disarmament (in the UK)
 * Campaign to Protect Rural England (CPRE) (formerly Council for the Preservation of Rural England)
 * campfire
 * camphor (see sentence 1 in paragraph 2)
 * camping
 * Campo Imperatore Near-Earth Objects Survey (CINEOS) (in Italy)
 * campsite
 * Campylobacter (genus of bacteria able to infect humans)

Can-Canadh

 * (Canada geography) geography of Canada (see under Hydrography and under Natural resources and under Natural hazards and under Current environmental issues)
 * Canada Goose (see "nuisance" in paragraph 4 and see "serious decline" in paragraph 8)
 * Canada Weather Extremes
 * Canada Well-Being Measurement Bill (see "ecosystems")
 * Canada's busiest airport

Canadi

 * Canadian Association of Petroleum Producers (CAPP)
 * Canadian Astronomical Society
 * (Canadian beaver: see) American Beaver (see "Their dams help" in paragraph 7 of preamble and see "their dams can cause flooding" in paragraph 1 under Threats)
 * Canadian Burn Foundation
 * Canadian Cancer Society
 * (Canadian Cascades) Cascade Range (see under Human uses and under Protected areas and under Provincial Parks)
 * Canadian Coast Guard (CCG) (Garde côtière canadienne) (GCC)
 * Canadian Coast Guard Auxiliary (CCGA)
 * Canadian Coast Guard College (CCGC)
 * Canadian Council for Tobacco Control (CCTC) (formerly Canadian Council on Smoking and Health [CCSH])
 * Canadian Environment Awards
 * Canadian Environmental Protection Act (of 1999)
 * (Canadian Falls) Horseshoe Falls (Canada) (see "hydroelectricity" in paragraph 4)
 * Canadian Food Inspection Agency (CFIA)
 * Canadian Forest Service
 * Canadian Geographic (bimonthly magazine) (see "environmental geography" in paragraph 2)
 * Canadian Geographic Information Systems (CGIS)
 * Canadian Grain Commission
 * Canadian Health Network
 * Canadian Hurricane Centre
 * Canadian Hydro Developers Inc.
 * Canadian Hydrographic Service (CHS)
 * Canadian Institutes of Health Research (CIHR) (see "environmental factors" in paragraph 5)
 * Canadian National Parks
 * Canadian Natural Resources Limited
 * Canadian Nuclear Safety Commission (CNSC)
 * Canadian Parks and Wilderness Society (CPAWS)
 * Canadian response to Hurricane Katrina
 * Canadian Ski Patrol (CSP) (providing safety and rescue services)
 * Canadian Space Agency (CSA) (l'Agence spatiale canadienne) (ASC) (see under Canadian satellites)
 * Canadian Urban Transit Association (CUTA)
 * Canadian Weather (http://www.canadianweather.org)
 * Canadian Wildlife Service (CWS) (Service canadien de la faune) (SCF)

Canae-Canaz

 * canal (see also list of waterways and list of canals in the United States)
 * canal lock (navigation lock)
 * (Canal Zone: 2 meanings selected from disambiguation page)
 * Suez Canal Zone
 * Panama Canal Zone
 * canals of Ireland
 * canals of the United Kingdom
 * canary (see "early warning system" in paragraph 7 under Pet canaries)

Canb-Canz

 * (Canberra bushfires of 2003) 2003 Canberra bushfires (in Australia)
 * Canberra Commission on the Elimination of Nuclear Weapons (in 1996) (in Australia)
 * Canberra Nature Park (in Australia)
 * (Canberra storms December 2 2005: see) severe storms in Australia (see paragraph 1 under Australian Capital Territory)
 * cancer (see under Environment and diet)
 * Cancer Alley (in Louisiana in the US)
 * cancer cluster (in epidemiology)
 * Cancún (a city in Mexico) (see under Environmental concerns and under Hurricane Wilma)
 * candela (cd) (SI unit of luminous intensity)
 * Candida (genus) ("a genus of yeasts ... that can cause fungal infections")
 * Candida control diet
 * Candidiasis ("commonly called yeast infection or thrush")
 * candle (see under Fuel and candle holders and under Hazards)
 * candle clock
 * cane rat ("a pest species on many crops")
 * cane spider ("they feed on pests")
 * (cane toad) Giant Neotropical Toad ("introduced ... [to] control agricultural pests")
 * canine distemper (infectious disease affecting animals)
 * canine influenza (dog flu)
 * canine parvovirus (CPV) ("a contagious virus affecting dogs")
 * cannabis (drug) (listed because of environmental effects of cultivation)
 * cannabis cultivation (see especially under Traditional Outdoor Cultivation Techniques)
 * cannabrick construction ("a sustainable development resource for housing")
 * cannel coal (candle coal)
 * cannibalism (see under Non-human cannibalism)
 * (canola) rapeseed (see under Cultivation and uses and under Rapeseed and health and under Controversy and under Pests and diseases affecting rapeseed)
 * (canopy [forest]: see) rainforest (see under The canopy)
 * canopy research (in forest canopies)
 * canopy walkway (in a forest canopy)
 * Canton, Illinois Tornado of 1975 (in the US)
 * canyon (gorge)

Cao-Caq

 * Cape Canaveral (in Florida in the US) (see "chosen for rocket launches" in paragraph 6)
 * Cape Lion ("specimens ... found ... in Russia")
 * Cape Verde-type hurricane
 * Cape Vulture (Cape Griffon) ("Vulnerable")
 * Cape Wind Project (a planned wind farm) (in Massachusetts in the US)
 * Capitan Gap fire (in 1950) (in New Mexico in the US)
 * capping inversion (in meteorology) (see "severe thunderstorms" in paragraph 5)
 * Caprivi (the Caprivi Strip) (Caprivi Region) (formally known as Itenge) (in Namibia in Africa) (see "wildlife" in paragraph 2 under Geography)
 * captive breeding
 * Capuchin catacombs of Palermo (in Sicily in Italy)

Car-Cara

 * car (see under Environmental improvements and under Alternative fuels and batteries)
 * (car accident: see) motor-vehicle collision (traffic collision) (auto accident) (road accident) (motor vehicle collision)
 * car alarm
 * Car and Driver (American magazine)
 * car battery
 * car bomb
 * car boot sale (useful for managing resources and waste)
 * car chase
 * car co-op (car share) (car club)
 * (car crash: see) motor-vehicle collision (traffic collision) (auto accident) (road accident) (motor vehicle collision)
 * (car culture: see) effects of the automobile on societies (see under Environmental changes)
 * (car ferry: see) train ferry
 * Car Free Days
 * car handling (vehicle handling)
 * (car horn: see) Klaxon ("trademark for an electromechanical horn or alerting device")
 * car noise
 * car safety
 * car surfing
 * (car tax: see) vehicle excise duty (VED) (road tax) (see "carbon dioxide" in paragraph 3)
 * car-free movement
 * car-free zone (auto-free zone) (pedestrianised zone) (see also list of carfree places)
 * (car-park: see) parking lot (see under Environmental considerations)
 * (car-pool lane: see) high-occupancy vehicle (HOV)
 * car-trains

Carb

 * carbide lamp (acetylene lamp)
 * carbofuran ("the most toxic of the carbamate pesticides") ("trade name Furadan")
 * carbon (see under Precautions)
 * carbon audit regime
 * (carbon black) soot (lampblack) (Pigment Black 7)
 * carbon credit
 * carbon cycle
 * carbon dioxide (see under Atmosphere)
 * (carbon dioxide emissions: see) list of countries by carbon dioxide emissions
 * carbon dioxide emissions in mainland China
 * carbon dioxide laser (CO2 laser)
 * (carbon dioxide poisoning) hypercapnia
 * carbon dioxide sink (CO2 sink)
 * carbon emissions trading
 * (carbon fiber reinforced plastic) graphite-reinforced plastic (CFRP) (CRP) (see under Recycling)
 * carbon filtering ("a method of water purification")
 * carbon fixation
 * carbon flux
 * carbon footprint
 * carbon intensity
 * (carbon market: see) carbon emissions trading
 * carbon monoxide (see under Toxicity and under Carbon monoxide in the atmosphere)
 * carbon monoxide detector
 * carbon monoxide poisoning
 * carbon nanofoam
 * carbon nanotube
 * carbon offset
 * carbon sequestering
 * (carbon sink: see) carbon dioxide sink (CO2 sink)
 * carbon tax
 * carbon tetrachloride (tetrachloromethane) (see under Safety)
 * (carbon trading: see) carbon emissions trading
 * carbonic acid (see under Carbonic acid and rain water)
 * carbonization
 * (carbonyl chloride) phosgene ("was used as a chemical weapon")
 * carburetor heat (carburettor heat) (carb heat) ("to help prevent or clear carburetor icing")
 * carburetor icing (carburettor icing)

Carc-Carz

 * carcinogen
 * cardboard (see "recyclable" in paragraph 2 under Today's corrugated cardboard)
 * cardboard box (see "house" in paragraph 4 of preamble and see footnote references)
 * Carfree Cities
 * cargo ship (freighter)
 * (Caribbean Disaster Emergency Response Agency) CDERA
 * Caribbean Meteorological Institute (CMO)
 * Caribbean Monk Seal ("now considered extinct")
 * Caribbean Plate ("an oceanic tectonic plate")
 * carjacking
 * Carlsbad Caverns National Park (in New Mexico in the US) (see "sanctuary" in paragraph 1 under Bats and see "bat guano ... as fertilizer" in paragraph 1 under History)
 * carnivore
 * carnivorous plant
 * carnivorous trees
 * Carolus Linnaeus (see under Linnaean taxonomy)
 * (carpark: see) parking lot (see under Environmental considerations)
 * Carpathian Convention (for "the protection and sustainable development of the Carpathians")
 * Carpathian Mountains (in Europe) (see under Convention on the protection of the Carpathians)
 * carpenter ant (see "poison arrow frogs")
 * carpenter bee (important pollinator) (see "pollinator decline" under Deterrence)
 * carpet bombing (area bombing)
 * carpool (see under Advantages and under Disadvantages)
 * (carpool lane: see) high-occupancy vehicle (HOV)
 * carrion ("can be a source of disease")
 * carrion beetle ("name ... not accurate")
 * Carrion Crow (see "eater of carrion" in paragraph 3 under Characteristics)
 * carrion flower (stinking flower)
 * carrying capacity
 * carsharing
 * Carson Sink (see paragraphs 3 and 5)
 * Cartagena Protocol on Biosafety
 * cartography (mapmaking)
 * Carysfort Reef lighthouse (in Florida in the US)

Cas

 * Cascade Alpine Guide (any one of a series of climbing guides)
 * Cascade Head (a Biosphere Reserve) (in Oregon in the US)
 * Cascade Range (see under Human uses and under Protected areas and under Provincial Parks)
 * Cascadia Earthquake (in 1700) (in western North America)
 * Cascadia subduction zone (in 1700) (in western North America)
 * cash crop (see paragraph 5)
 * (Caspian oil pipeline: see) Baku-Tbilisi-Ceyhan pipeline (see under Environment)
 * Caspian Sea (see under Fauna and see under Oil and see paragraph 1 [before list] under International Disputes and see under Characteristics and ecology)
 * Caspian Tiger (Persian Tiger) (extinct)
 * casualties of energy

Cat-Cata

 * cat (see under Environmental impact)
 * cat litter (see under Biodegradable litter)
 * (cat litter box: see) litter box
 * cat scratch fever (cat-scratch disease) (Parinaud oculoglandular disease) (la maladie des griffes du chat)
 * (catabatic wind: see) katabatic wind
 * catacombs
 * catagenesis (geology)
 * (catalogue astrographique) star catalogue
 * catalytic converter ("to reduce ... emissions") (see under Catalyst Poisoning)
 * (catalytic cracking: see) cracking (chemistry) (applied in petroleum geology)
 * catalytic reformer
 * (catastrophe: 1 meaning selected from disambiguation page)
 * disaster
 * catastrophe modeling (cat modeling)
 * catastrophic failure
 * Catastrophic Florida hurricanes: 1900-1960
 * Catastrophic Florida hurricanes: 1961-present
 * catastrophic kill (type of damage to a vehicle)
 * catastrophism

Catb-Catz

 * (catback exhaust: see) exhaust system (see under Cat-back)
 * catch and release ("a form of recreational fishing")
 * catch crop
 * (catchment area: 1 meaning selected from disambiguation page)
 * water catchment area
 * (catchment basin) drainage basin (water basin) (watershed)
 * catchwater
 * catchwater drain
 * (category 1 hurricane: see) Saffir-Simpson Hurricane Scale (see same for "category 2 hurricane" and "category 3 hurricane" and "category 4 hurricane" and "category 5 hurricane")
 * (category one special nuclear material: see) special nuclear material (see same for "category two special nuclear material" and "category three special nuclear material")
 * caterpillar (see "pests" in paragraph 8)
 * cathode heater
 * cathodic protection (CP)
 * cathode ray tube (CRT) (see under Health danger and under High vacuum safety)
 * cattle (see under Uses of cattle and under Ox)
 * (cattle dog: see) Australian Cattle Dog (ACD) (Queensland Hereler) (Blue Heeler) (Red Heeler)
 * Cattle Egret (see paragraph 5)
 * cattle grid (cattle guard)
 * cattle mutilation
 * cattle raiding in Kenya
 * (cattle ranch: see) ranching
 * cattle rustling (cattle raiding)
 * cattle station

Cau-Caz

 * Caucasian honeybee (important pollinator) (see under Behavior)
 * (causes of earthquakes: see) earthquakes (see under Causes)
 * (causes of haze: see) haze
 * (causes of Hurricane Katrina: see) alternative theories regarding Hurricane Katrina
 * causeway
 * Causeway Bay (in Hong Kong) (see "land reclamation" under History)
 * causewayed enclosure (term "causewayed enclosure" preferred to older term "causewayed camp")
 * causewayed ring ditch
 * cave (see also list of caves)
 * Cave Bear (extinct)
 * Cave Creek Complex fire (in 2005) (in Arizona in the US)
 * Cave Creek disaster (in 1995) (in New Zealand)
 * cave digging (see "explosive material" in paragraph 3)
 * (cave diver: see) recreational diving
 * cave diving (see under Hazards)
 * cave lion (European cave lion) (Eurasian cave lion) (extinct)
 * cave monastery
 * cave painting (rock painting)
 * Cave Research Foundation (CRF) (in the US)
 * cave rescue
 * cavefish
 * Caverns of Sonora (in Texas in the US)
 * caviar ("the processed, salted roe of various species of fish, most notably sturgeon") (see "overfishing and pollution" in paragraph 2)
 * caving (cave exploration)
 * (Cayapo) Kayapo (a native people living in rainforests in Brazil)

Cb-Cd

 * CDERA (Caribbean Disaster Emergency Response Agency)

Ce-Cem

 * Cedar Fire (in 2003) (in California in the US)
 * ceiling balloon ("to determine the height of the base of clouds above ground level")
 * ceilometer ("to determine the height of a cloud base")
 * celebrations of the September 11, 2001 attacks
 * celestial coordinate system
 * celestial equator
 * celestial horizon (rational horizon)
 * celestial navigation (astronavigation)
 * celestial pole
 * cell phone jammer
 * cell site (mobile phone mast) (cellular base station) (Personal Communications Service [PCS] station)
 * cell-mediated immunity
 * cellophane (see paragraph 3)
 * (cellular tumor antigen p53: see) P53 ("It is very important for cells in multicellular organisms to suppress cancer.")
 * Celsius
 * cement
 * cemetery (graveyard) (see also list of cemeteries)

Cen

 * Center for Analysis and Prediction of Storms (CAPS) (in Oklahoma in the US)
 * Center for Consumer Freedom (CCF) (formerly called the Guest Choice Network) (in the US)
 * Center For Earth and Planetary Studies (CEPS)
 * Center for Elephant Conservation (in Florida in the US)
 * (Center for Environmental and Estuarine Studies: renamed) University of Maryland Center for Environmental Science (UMCES) (in the US)
 * Center for Functional Nanomaterials (CFN) (in the US)
 * Center for Integrated Nanotechnologies (in the US)
 * Center for International Environmental Law (CIEL)
 * Center for International Forestry Research (CIFOR) (based in Indonesia)
 * Center for Nanophase Materials Sciences (in the US)
 * Center for Nanoscale Materials (in the US)
 * Center for Planetary Research (in Denmark)
 * Center for Responsible Nanotechnology (in the US)
 * Center for Science in the Public Interest (CSPI) (in the US)
 * (Center for the Application of Molecular Biology to International Agriculture) CAMBIA (in Australia)
 * Center for the Study of Carbon Dioxide and Global Change (based in Arizona in the US)
 * center high-mounted stop lamp (CHMSL)
 * center of population
 * Center on Animal Liberation Affairs (CALA)
 * center pivot irrigation (a method of crop irrigation)
 * (center pivot irrigation in Saudi Arabia: see) irrigation in Saudi Arabia
 * Centers for Disease Control and Prevention (CDC) (in Atlanta in the US)
 * centimetre gram second system of units (CGS)
 * central air conditioning
 * (Central America Hurricane of 1857: see) SS Central America (Ship of Gold)
 * Central American Volcanic Belt
 * Central Arizona Project Aqueduct (CAP) (in the US)
 * (Central Artery/Tunnel Project [CA/T]) Big Dig (Boston, Massachusetts) (in the US)
 * Central Black Earth Region (Central Chernozem Region) (in Russia)
 * Central Eastern Rainforest Reserves (in Australia)
 * Central England temperature
 * Central European Summer Time (CEST)
 * Central Florida Tornado of February 2007
 * Central Park Zoo (in New York City)
 * central reservation (median [highway])
 * Central Valley Project (CVP) (in California in the US)
 * Central Valley Project Water Association (CVPWA)
 * centralized traffic control (CTC) (in rail transport)
 * Centre for Education and Research in Environmental Strategies (CERES) (environment park in Australia)
 * Centre for Environment Education, India (CEE)

Ceo-Cez

 * ceramic discharge metal halide lamp
 * cereal ("In some developing nations, cereal grains constitute practically the entire diet of common folk.")
 * cereal leaf beetle ("an agricultural pest and biological control success story")
 * (CERES) Centre for Education and Research in Environmental Strategies (environment park in Australia)
 * CERES (Clouds and the Earth's Radiant Energy System) ("an on-going NASA meteorological experiment in Earth orbit")
 * CERN (European Organization for Nuclear Research) (Organisation Européenne pour la Recherche Nucléaire)
 * Cerrado (ecoregion) (in Brazil)
 * Cerros Colorados Reservoir (in Argentina) (see "erosion")
 * Certified Landscape Professional (CLP)
 * (certified organic: see) organic certification
 * Certified Ornamental Landscape Professional (COLP)
 * Certified Turfgrass Professional
 * Certified Turfgrass Professional-Cool Season Lawns
 * certified wood
 * cesium (see under Precautions)
 * cetacean bycatch
 * Cetacean Conservation Center (Centro de Conservación Cetacea) (in Chile)
 * cetology (branch of marine mammal science)

Cf-Cg

 * (CFC) chlorofluorocarbon

Ch-Cha

 * Chad-Cameroon Petroleum Development and Pipeline Project (in Africa)
 * Chagas disease (American trypanosomiasis) ("a human tropical parasitic disease") (see under Prevention)
 * chain pumps (see "irrigation" in paragraph 2)
 * chalk ("resistant to erosion")
 * (chalk downland: see) downland (see under Downland habitat)
 * chalk formation (see under Chalk petroleum reservoirs)
 * (chalk grassland: see) calcareous grassland (alkaline grassland)
 * Chalk River Laboratories (a Canadian nuclear research facility) (in Ontario in Canada)
 * chalk river unidentified deposits (Chalk River unidentified deposits)
 * chalk stream
 * (Challenger disaster) Space Shuttle Challenger disaster
 * (Challenger Space Shuttle) Space Shuttle Challenger
 * Changde chemical weapon attack (in 1943) (by Japan against China)
 * channel (geography)
 * Channel Islands (in the UK) (see "tidal variation" in paragraph 4 under Geography)
 * Channel Islands National Marine Sanctuary (in California in the US)
 * Channel Islands National Park (in California in the US)
 * Channel Islands of California (Santa Barbara Islands) (see under Wildlife)
 * Channel Tunnel (le tunnel sous la Manche) (the Chunnel) (the Tunnel) (see under Fire)
 * channelization (in environmental engineering)
 * chaos theory (see "butterfly effect" under Chaotic motion)
 * (Chapman cycle: see) ozone-oxygen cycle
 * characteristic earthquakes
 * characteristic light
 * charcoal (see "deforestation" in paragraph 2 under Production and see "gas mask" in paragraph 2 under Use)
 * (charcoal filtering: see) activated carbon (activated charcoal) (see under Environmental applications)
 * charity shop (thrift store) (op shop) (useful for managing resources and waste)
 * Charles Darwin Foundation ("dedicated to the conservation of ecosystems of the Galapagos Islands")
 * Charles Darwin National Park (in Australia)
 * Charles Darwin Research Station (in Puerto Ayora on Santa Cruz Island in the Galapagos Islands)
 * (charred bone) bone char (bone black) (animal charcoal) (see under Uses)
 * charring
 * Chart of Nuclides (describing the nuclear, or radioactive, behavior of nuclides)
 * Chartered Institute of Environmental Health (CIEH) (in the UK)

Che-Chel

 * (CHEERS) Children's Environmental Exposure Research Study (in the US)
 * cheetah (see under Habitat and under Conservation status)
 * chelation (see "water softeners" in paragraph 2 and see "environmentalists" in paragraph 5 and see "ecology" in paragraph 7)

Chem

 * chemical accidents
 * Chemical and Biological Arms Control Institute (CBACI)
 * chemical attack
 * Chemical, Biological, Radiological and Explosive Defence Group (CBRE) (in Singapore)
 * Chemical Coast (see "Emissions" in paragraph 3)
 * chemical composition of living beings
 * chemical ecology
 * (chemical element abundance) abundance of the chemical elements
 * chemical elements data references
 * (chemical explosive: see) explosive material
 * (chemical fertilizer: see) fertilizer (see under Environmental effects of fertilizer use)
 * Chemical Galaxy (a new periodic table)
 * chemical hazard
 * chemical hazard label
 * chemical industry
 * chemical laser
 * chemical makeup of the human body
 * chemical oceanography
 * chemical oxygen demand (COD) (in environmental chemistry)
 * chemical oxygen generator (solid fuel oxygen generator) (SFOG) (TGK) (see under Uses
 * chemical oxygen iodine laser (COIL)
 * chemical tanker
 * chemical toilet
 * chemical warfare (see also list of chemical weapon agents)
 * chemical waste
 * chemical weapon designation
 * chemical weapon proliferation
 * Chemical Weapons Convention (Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction)
 * (chemical weathering: see) weathering (see under Chemical Weathering)
 * chemigation valve (in agriculture)
 * Chemists Without Borders (CWB) (see "sustainable energy")
 * chemtrail theory

Chen-Chez

 * (Chenier Caminanda Hurricane) 1893 Chenier Caminanda Hurricane (in Louisiana in the US)
 * Cherenkov radiation (see under Uses)
 * Chernobyl (Chornobyl) (see paragraphs 5 and 6 under History)
 * Chernobyl accident (in 1986) (in Ukraine)
 * Chernobyl Children's Project International (CCPI) (by the UN)
 * Chernobyl2020 (commemorative exhibition)
 * chernozem (black earth) ("a kind of soil") ("does not require any fertilizing")
 * CHESF (Companhia Hidro-Elétrica do São Francisco; São Francisco's Hydroelectric Company) (in Brazil)
 * Chevron Corporation ("one of the world's largest global energy companies")
 * Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc. (see under Facts)
 * chewing gum ban in Singapore (see paragraphs 2 and 4 under History)
 * Cheyenne Plains Gas Pipeline (in the US)

Chi-Chim

 * Chi-Chi earthquake (in 1999) (in Taiwan)
 * Chicago (in the US) (see under Great Chicago Fire and under 2004 Chicago Earthquake)
 * Chicago Botanic Garden (in the US)
 * Chicago Climate Exchange (CCX)
 * Chicago Flood (in 1992)
 * Chicago Heat Wave of 1995
 * Chicago Sanitary and Ship Canal
 * Chicago Transit Authority (CTA)
 * Chicago Tunnel Company (see under Disaster)
 * Chicagoland Bicycle Federation (CBF)
 * chicken coop (chickenhouse)
 * (chicken factory: see) factory farming
 * chicken flu ("an avian flu that can affect humans")
 * chickenpox (chicken pox) (varicella disease) ("highly contagious")
 * chigger (arthropod) (jigger)
 * chigoe flea
 * Children's Environmental Exposure Research Study (CHEERS) (in the US)
 * children's traffic park at Shivaji Garden (in India)
 * (children's zoo: see) petting zoo
 * chimney (see under Drawbacks)
 * chimney felling
 * chimney sweep (see "toxic gases" in paragraph 4)
 * Chimney Swift (bird) (see "habitat" in article)

Chin

 * China (see "drought" and "dust storms" in paragraph 4 under Geography and climate)
 * China Aerospace Science and Technology Corporation (CASC)
 * China Agricultural University (in Beijing in China)
 * China Australia Migratory Bird Agreement
 * (Chinese CO2 emissions) Carbon dioxide emissions in mainland China
 * Chinese fishing nets (of Kochi) (in India)
 * (Chinese famine of 1958-1961: see) Three Years of Natural Disasters
 * Chinese garden
 * (China National Offshore Oil Corporation) CNOOC Ltd.
 * China National Petroleum Corporation
 * China Oilfield Services
 * China Petroleum & Chemical
 * (China Syndrome: 2 meanings from disambiguation page)
 * nuclear meltdown
 * The China Syndrome, a 1979 movie dramatizing the events of a nuclear meltdown
 * China University of Geosciences
 * Chinese restaurant syndrome (monosodium glutamate symptom complex) (see "mold" under Cause)
 * Chinese River Dolphin (see under The chronology of the species' rapid decline and under Conservation and under Three Gorges Dam)
 * (Chinese space program) space program of China
 * Chinese White Dolphin (see under Threats and under Timeline of main events)
 * Chinook wind (see "inversion smog" under Chinooks and health)

Chio-Chiz

 * chionophile
 * Chipko movement (see "tree hugger" in preamble)
 * Chiquita Brands International Inc. (see "polluting the environment" in paragraph 1 under Cincinnati Enquirer Controversy)
 * chisel plow (see "sustainable" in paragraph 1)

Chj-Chq

 * chlamydia (see under Chlamydia in nonhumans)
 * Chlamydophila pneumoniae (previously known as Chlamydia pneumoniae)
 * Chlorfenvinphos (insecticide)
 * (chlorinated fluorocarbons: see) haloalkane (see under Environmental issues)
 * chlorination ("a method of water purification")
 * chlorine (see under Precautions)
 * chlorine dioxide ("can explode easily") (see under Uses)
 * (chlorofluorocarbons: see) haloalkane (see under Environmental issues)
 * chlorosis
 * chocolate (see under Lethal toxicity for domesticated animals and under Lead)
 * (chocolate poisoning) theobromine poisoning
 * cholera (see under Transmission and under Spread and under Prevention)
 * cholera epidemic of 1831
 * Cholera Riots (in 1830-1831) (in Russia)
 * Chota Nagpur dry deciduous forests (in India)

Chr-Chz

 * Christian Vegetarian Association (CVA)
 * christian vegetarianism
 * christian views on cloning
 * Christmas Bird Count (CBC)
 * Christmas bonfires (in Louisiana in the US)
 * Christmas flood 1717 (Kerstvloed 1717) (in northern Europe)
 * Christmas Island (see under Flora and fauna)
 * Christmas Island Frigatebird (see paragraph 2)
 * Christmas lights (fairy lights) (twinkle lights)
 * Christmas tree (see under Artificial trees  [especially under Environmental issues ] and see under Care and disposal of natural trees)
 * christmas tree (oil well)
 * chromium (see under Precautions)
 * chronic toxicity
 * chronology of world oil market events (1970-2005)

Ci-Cis

 * cigar (see under Health issues)
 * cigarette (see "inhalation" and "farmland" in paragraph 4 under Health effects and see "public smoking bans" in paragraph 6 under same)
 * (cigarette lighter: see) lighter
 * (cigarette packet warning signs: see) tobacco packaging warning signs (see under United Kingdom and Ireland)
 * (cigarette smoking: see) tobacco smoking (see under Health effects and under Passive smoking )
 * cigarillo
 * ciguatera (a foodborne illness poisoning)
 * (Cimicidae: see) bedbug (bed bug)
 * Cimmerian plate ("an ancient tectonic plate")
 * Cincinnati Zoo and Botanical Garden (in Ohio in the US) ("world renowned for its breeding programs")
 * cinder (see "used" in preamble and see under Uses)
 * cinder cone (in volcanology)
 * circadian rhythm (see "design of spacecraft environments" in paragraph 2 under Animal circadian rhythms and see "stress tolerant plants" in paragraph 2 under Plant circadian rhythms)
 * circadian rhythm disorders
 * circle of latitude (parallel)
 * (circumferential highway) beltway (ring road) (orbital motorway)
 * circumnavigation
 * circumpolar arctic

Cit-Ciz

 * (CITES) Convention on the International Trade in Endangered Species of Wild Flora and Fauna
 * cities along the Silk Road
 * cities with the most highrise buildings
 * (cities with the most people: see) List of cities by population
 * Citizens for Alternatives to Chemical Contamination (CACC) (based in Michigan in the US)
 * Citizens for Global Solutions (see "global health and environment" under Activism and Advocacy)
 * Citrus Vein Phloem Degeneration (CVPD) (Citrus Greening Disease) (Yellow Shoot Disease) (Yellow Dragon Disease) (Likubin) (Immediate Withering Disease) (Leaf Mottle Yellows) (Citrus Dieback)
 * citrus production (see under Citrus canker)
 * City Beautiful movement
 * City Life (book)
 * (city bus: see) transit bus (commuter bus)
 * (city parks: see) list of municipal parks in the United States
 * (city pigeon: see) Rock Dove (see under Feral pigeons in cities)
 * (city planning: see) urban planning (see under Planning and the environment)
 * city rhythm
 * city services
 * city simulation

Cl-Cld

 * Clark County Regional Flood Control District (CCRFCD) (in Nevada in the US)
 * Clark County Water Reclamation District (CCWRD) (in Nevada in the US)
 * Clark County Wetlands Park (in Nevada in the US)
 * classical swine fever (CSF) (hog cholera)
 * classification of electromagnetic fields
 * classification yard (marshalling yard) (for railroad cars)
 * Claus process ("the most significant gas desulfurizing process") (for crude oil)
 * clay (see "landslides" in paragraph 5)
 * clay earth pigment
 * clay pit
 * Clay Pit Ponds State Park Preserve (on Staten Island in New York state in the US)
 * clay-water interaction
 * Clayoquot Sound (on Vancouver Island in British Columbia in Canada) (see paragraphs 3 and 4)

Cle-Clh

 * (clean air: see) Air pollution
 * Clean Air Act (in the US)
 * Clean Air Act 1956 (in the UK)
 * Clean Air Act (1970) (in the US)
 * Clean Air Act (1990) (in the US)
 * clean coal
 * Clean Development Mechanism (CDM) (under the Kyoto Protocol)
 * (clean energy: see) green energy
 * Clean Energy Future Group (in Australia)
 * Clean Up Australia
 * (Clean Urban Transport for Europe: see) Fuel Cell Bus Club (see under CUTE)
 * Clean Water Act (in the US)
 * cleaner shrimp
 * cleaning station (in marine biology)
 * cleanroom (a type of manufacturing environment)
 * cleanroom suit (clean suit) (bunny suit) ("an overall garment worn in a clean room")
 * Clear Skies Act of 2003 (in the US)
 * clear-air turbulence (CAT)
 * clearance car (type of railroad car)
 * Clearance Diver (dealing with explosives underwater)
 * clearfelling (clearcutting)
 * CLEO Cisco router in Low Earth Orbit (an Internet router)
 * Cleveland East Ohio Gas Explosion (in 1944)

Cli-Clil

 * click beetle (see "pests" in paragraph 2)
 * cliff
 * (cliff jumping: see) jumping platform
 * (cliff railway) funicular (funicular railway) (inclined railway) (inclined plane)
 * cliff-dwelling

Clim-Clima

 * climate
 * Climate and Geography of Halifax Regional Municipality (in Canada)
 * Climate Audit (commentary site [blog] on climate change)
 * climate change
 * (Climate Change 1995: see) Intergovernmental Panel on Climate Change
 * (climate change controversy: see) global warming controversy
 * (Climate Change Convention: see) United Nations Framework Convention on Climate Change (UNFCCC) (FCCC)
 * (Climate Change Levy: see) United Kingdom Climate Change Programme
 * (Climate Change Programme: see) United Kingdom Climate Change Programme
 * (Climate Change-Kyoto Protocol: see) Kyoto Protocol
 * climate changes of 535-536
 * climate commitment studies
 * (climate control: see) HVAC
 * (climate crash: see) abrupt climate change
 * Climate Diagnostics Center (in the US)
 * climate engineering
 * (climate forcing: see) radiative forcing
 * Climate Group
 * climate house
 * climate model
 * climate modeller
 * Climate Monitoring and Diagnostics Laboratory (CMDL) (in the US)
 * climate of Adelaide
 * climate of Antarctica
 * climate of Chicago
 * climate of Costa Rica
 * climate of Hong Kong
 * climate of India
 * climate of Karachi
 * climate of London
 * climate of Missouri
 * climate of Salt Lake City
 * climate of Scotland
 * (climate of Singapore: see) geography and climate of Singapore (see under Climate of Singapore)
 * climate of the Alps
 * climate of the United Kingdom
 * climate of Virginia
 * Climate Outreach and Information Network (British charity)
 * (climate parameters, forcings and feedbacks: see) parametrization (climate)
 * (climate science: see) climatology
 * climate sensitivity
 * (climate simulation: see) climate model
 * climate surprise
 * (climate techno-fix: see) climate engineering
 * (climate theory: see) Charles de Secondat, Baron de Montesquieu (see "climate theory" in paragraph 3 under Political views)
 * (climate variability: see) climate change
 * (climate warming: see) global warming
 * (climate weapon: see) Weather Modification Operations and Research Board (in the US) (see under Weather Control)
 * climateprediction.net (distributed computing project)
 * climatic determinism (equatorial paradox) (see also environmental determinism)
 * Climatic Regions of India
 * Climatic Research Unit (at the University of East Anglia in the UK)
 * (climatic zone: see) clime
 * climatology
 * climax community
 * climax vegetation

Climb-Climz

 * climbing
 * climbing area
 * climbing command
 * climbing equipment (climbing gear)
 * climbing galaxias (a fish of Australia and New Zealand)
 * climbing garden
 * (climbing glossary) glossary of climbing terms
 * (climbing grade) grade (climbing)
 * climbing guidebook
 * climbing harness
 * climbing hut
 * (climbing on sight) on-sight climbing
 * (climbing protection) protection (climbing)
 * climbing route
 * climbing shoe
 * climbing specialist (cycling)
 * climbing system
 * climbing technique
 * climbing wall
 * clime (climatic zone)

Clin-Cliz

 * (clinical ecology) environmental medicine
 * clinical surveillance
 * Clinton Global Initiative (see "Climate Change" under Stated goals)
 * clipping (gardening)

Clo

 * Cloaca Maxima ("one of the world's earliest sewage systems")
 * (clone [botany]: see) vegetative reproduction (see "clones" under Horticultural aspects)
 * clone (genetics)
 * cloning
 * Cloning: At Issue (2003) (book)
 * (cloning extinct species: see) cloning (see under Cloning extinct species)
 * closed ecological system (CES)
 * Clostridium (a genus of bacteria) ("includes common free-living bacteria as well as important pathogens")
 * clothing (see under Functional clothing)
 * cloud (see under Global dimming)
 * cloud albedo ("a measure of the reflectivity of a cloud")
 * cloud base ("the lowest portion of a cloud")
 * cloud chamber (Wilson chamber) ("for detecting ... ionizing radiation")
 * cloud condensation nuclei (CCNs) (see under Phytoplankton role)
 * cloud cover
 * cloud feedback
 * cloud forcing (see "greenhouse effect" in paragraph 2)
 * cloud forest
 * (cloud formation: see) nephology
 * cloud physics
 * cloud seeding
 * cloud street
 * cloud suck
 * cloud types
 * cloud-buster
 * cloudburst (see "destruction" in paragraph 2 and see "Mumbai" in paragraph 3)
 * (Clouds and the Earth's Radiant Energy System) CERES ("an on-going NASA meteorological experiment in Earth orbit")
 * CloudSat ("a NASA environmental satellite")
 * cloverleaf interchange

Cm-Cn

 * CNOOC Ltd. (China National Offshore Oil Corporation)

Co-Coa

 * coach (vehicle)
 * coal (see especially under Harmful effects of coal burning)
 * coal bed methane extraction (CBM extraction)
 * coal dust (see under Risks and under Coal dust in energy generation)
 * (coal gas: see) syngas
 * (coal gasification: see) coal (see under Gasification)
 * (coal liquefaction: see) coal (see under Liquefaction)
 * coal measure
 * (coal mine fire: see) mine fire
 * Coal Mine Safety and Health Act of 1969 (in the US)
 * coal mining (see under Dangers to miners and under Environmental impacts)
 * coal oil
 * coal pier
 * (coal pit: see) coal mining
 * (coal power plant: see) fossil fuel power plant (FFPP)
 * coal tar
 * coal trucks
 * (coal workers' pneumoconiosis: see) pneumoconiosis
 * (coal-burning power plant: see) fossil fuel power plant (FFPP)
 * (coal-fired power station Ekibastusz: see) Power Station Ekibastusz
 * (coal-gas: see) town gas
 * coalbed methane (coalbed gas)
 * coast (see under Environmental importance and under Human impacts) (see also list of countries by length of coastline)
 * coast guard
 * coastal erosion
 * Coastal Management
 * (coastal marsh: see) marsh
 * coastal plain
 * coastal waterfall
 * (coastal wetland: see) wetland
 * Coastal Zone Management Act (of 1972) (in the US)

Cob-Cok

 * cobalt (see under Precautions)
 * cobalt bomb
 * (Coca-Cola Company: see) The Coca-Cola Company (see under Coca-Cola in India)
 * cocaine (see "hazards" in last paragraph under Freebase and see "defoliants" under Sources)
 * (Coccinellidae: see) ladybird (ladybug) (lady beetle) (see "organic gardeners" under Commercial usage)
 * Cochabamba protests of 2000 (in Bolivia) ("because of the privatization of the municipal water supply") (see under Declaration)
 * cockroach (see paragraphs 5 and 6 under iiology)
 * cocktail effect
 * cocoa (see "pollination" under Issues with cocoa as a commodity)
 * coconut (see "coconuts falling from trees" in paragraph 4 under The fruit)
 * coconut crab (see under Conservation status)
 * Cod War (between Iceland and the UK) (problem aggravated by overfishing)
 * code amber alert
 * Codex Alimentarius (see "food additives" and "pesticide residues" and "modern technology" under Scope)
 * codling moth ("agricultural pest")
 * coefficient of haze (in meteorology)
 * coelacanth (a species of fish, previously considered to be extinct)
 * coffee (see under "Ethical Coffee" and under Coffee as a fertilizer)
 * (coffeeweed) Senna obtusifolia (foetid cassia) (Chinese senna) (sicklepod) (sickle-pod) (sickle pod) (coffee weed) (coffee pod) (coffee-pod) (java bean) (java-bean) (arsenic weed)
 * (cofferdam: see) dam (see under Cofferdams)
 * coffin ship (see "sharks" in paragraph 3)
 * (cog railway) rack railway (rack-and-pinion railway)
 * cogeneration (combined heat and power) (CHP) (see under Types of plant)
 * (coherent radiation: see) laser (see under Laser safety)
 * coke (fuel) (see "deforestation" under History)

Col-Coln

 * (cold desert: see) desert (see paragraph 4 under Types of desert)
 * cold fusion (a type of nuclear fusion)
 * cold seep (cold vent) (an area of the ocean floor)
 * cold weather boot
 * cold weather rule (cold weather law) (for public utility companies)
 * (coldest place on earth: see) climate of Antarctica (see under Temperature)
 * coldest temperature achieved on earth
 * Coleman Company, Inc. (see "Coleman Lamp" in paragraph 4)
 * (coleopteran) beetle (order Coleoptera) (see under Impact on humans)
 * (coliform: see) Escherichia coli (E. coli) (bacterium indicating fecal contamination in groundwater) (see "coliform" in paragraph 2)
 * coliform bacteria
 * Coliform Index ("a rating of the purity of water")
 * Colima Volcano ("the most active volcano in Mexico")
 * Colin Campbell (geologist) ("predicts that oil production will peak by 2007")
 * collecting fossils
 * collective farming
 * collector road
 * Collège de Contrôle et de Surveillance des Ressources Pétrolières (in Chad)
 * (College of Environmental Science and Forestry: see) State University of New York College of Environmental Science and Forestry (SUNY-ESF)
 * collimated light (see "light from stars" in paragraph 3)
 * collimator (device)
 * colluvium (in geology)

Colo-Colz

 * (Colombian Coffee Federation) Federación Nacional de Cafeteros de Colombia
 * colonization of Mars
 * colonization of the Moon
 * Colony Collapse Disorder (CCD) (a honey bee disease)
 * Colorado-Big Thompson project ("a very large water diversion project in Colorado") (in the US)
 * Colorado Mineral Belt (CMB)
 * Colorado potato beetle (see under As a crop pest)
 * Colorado River (in the US and in Mexico) (see "rich estuarine marshland" in paragraph 5 under Course)
 * Colorado River (Argentina) (see "dam" in paragraph 3)
 * Colorado River (Texas)
 * Colorado river dispute (between the US and Mexico)
 * Colorado tick fever
 * Columbia Basin (in Canada and in the US)
 * Columbia Basin Project ("an irrigation project") (in Washington state in the US) (see under Environmental consequences)
 * (Columbia disaster: see) Space Shuttle Columbia disaster
 * Columbia Trail (in New Jersey in the US)
 * Columbian Exchange
 * (Columbian Exposition of 1893) World's Columbian Exposition (The Chicago World's Fair) (see under Electricity at the fair)

Com-Coml

 * combine harvester (combine)
 * combined cycle power plant (combined cycle gas turbine [CCGT] plant)
 * combined diesel-electric and gas (CODLAG) (for ships)
 * combined diesel and diesel (CODAD) (for ships)
 * combined diesel and gas (CODAG) (for ships)
 * combined diesel or gas (CODOG) (for ships)
 * combined gas and gas (COGAG) (for ships)
 * combined gas and steam (COGAS) (for ships)
 * combined gas or gas (COGOG) (for ships)
 * (combined heat and power [CHP]) cogeneration
 * combined nuclear and steam propulsion (CONAS) (for ships)
 * combined sewer
 * combined steam and gas (COSAG) (for ships)
 * (combustible: see) fuel
 * combustion (burning)
 * (combustion turbine) gas turbine
 * comet (pyrotechnics)
 * comfort noise ("in radio and wireless communications")
 * (comfort room: see) toilet (see under Etymology)
 * (Comité international des poids et mesures) (CIPM) International Committee for Weights and Measures

Comm-Commt

 * Committee on Climate Change Science and Technology Integration
 * Common Agricultural Policy (CAP) (in the European Union) (see under Environmental problems)
 * common asparagus beetle
 * common beta emitters
 * Common Chimpanzee (see "habitat" under Basic facts)
 * Common Dolphin (see under Conservation)
 * Common Ground (in the UK) (charitable organization)
 * (common land: see) commons
 * (Common Loon: see) Great Northern Diver (see "acid rain" and "pollution" and "dams" in paragraph 9)
 * (Common Porpoise) Harbour Porpoise (see under Population and distribution and under Conservation)
 * common rail direct fuel injection
 * Common Starling (European Starling) (see paragraphs 8 through 11)
 * common yabby (a crayfish) (see "aquaculture" and "dam banks")
 * common-pool resource (CPR) (common property regime [CPR]) (common property resource) (see paragraph 2 under Common-pool resource)

Commu-Commz

 * (communicable disease) infectious disease
 * (Communicable Disease Center: see) Centers for Disease Control and Prevention (CDC) (in Atlanta in the US)
 * (communicable disease reporting) infectious disease reporting
 * communication with submarines
 * communications satellite (comsat)
 * Community bicycle program
 * Community Climate System Model
 * community ecology
 * community emergency response team (CERT) (in the US)
 * Community Fisheries Control Agency (proposed) (in Europe)
 * Community Forests in England
 * Community Friendly Movement
 * community garden
 * community gardening
 * community separator (see paragraph 2)
 * community-acquired pneumonia (CAP)
 * community-supported agriculture (see "ecological, organic or biodynamic farming methods" in paragraph 1 under The CSA System)
 * (commuter belt) metropolitan area
 * (commuter bus) transit bus
 * (commuter rail) regional rail (see same for "commuter train")
 * (see also list of United States Commuter Rail systems by ridership)


 * commuter rail in North America
 * (commuter town) bedroom community (dormitory town)
 * (commuter transport) public transport (public transportation) (public transit) (mass transit)
 * commuting

Comp

 * compact fluorescent lamp (CFL) (compact fluorescent light bulb)
 * compactor (for waste material)
 * (Compagnie Française des Pétroles) Total S.A. (French oil company)
 * Compagnie universelle du canal maritime de Suez (Universal Suez Ship Canal Company)
 * (Companhia Hidro-Elétrica do São Francisco; São Francisco's Hydroelectric Company) CHESF (in Brazil)
 * (companion animal) pet
 * companion planting
 * compartmental models in epidemiology
 * (compass variation: see) magnetic declination
 * Compassion In World Farming (based in Europe) (for animal welfare)
 * competing species
 * competition (biology)
 * (complete IPCC list of greenhouse gases: see) IPCC list of greenhouse gases
 * (composite cone) (composite volcano) stratovolcano
 * compost
 * compost windrow turner
 * composting toilet
 * compound locomotive (see paragraph 2)
 * (Comprehensive Environmental Response, Compensation, and Liability Act [CERCLA]) Superfund (in the US)
 * Comprehensive Smoking Education Act (in the US)
 * Comprehensive Test Ban Treaty (CTBT)
 * Comprehensive Test Ban Treaty Organization (CTBTO)
 * compressed air energy storage (CAES)
 * compressed natural gas (CNG)
 * (compressed-air vehicle: see) air engine (see "no roadside emissions" in paragraph 3)
 * compression fossil
 * compulsive hoarding (pathological hoarding)
 * computational epidemiology
 * Computer Conservation Society (CCS) (in the UK)
 * (computer display/CRT: see) cathode ray tube (CRT) (see under Health danger and under High vacuum safety)
 * Computer History Museum (in the US)
 * computer recycling
 * Computers for African Schools (a charity in the UK)

Con-Conr

 * concentrated animal feeding operation (CAFO)
 * (concentration basin) mediterranean sea (in oceanography)
 * concrete
 * concrete canoe
 * concrete dome (see "natural disasters" in paragraph 3)
 * concrete jungle
 * concrete recycling
 * concrete ship
 * (condensate: 1 meaning selected from disambiguation page)
 * natural gas condensate
 * condensation
 * (condensation trail) contrail (vapor trail)
 * condensed matter physics
 * condenser (steam turbine)
 * condom (see under Environmental impact)
 * cone snail (cone shell) (see "venom" in paragraph 2 of preamble)
 * CONELRAD (Control of Electromagnetic Radiation) (in emergency broadcasting)
 * Conestoga wagon
 * Conference on the Human Environment (in 1972) (in Sweden)
 * (confined animal feeding operation) concentrated animal feeding operation (CAFO)
 * (confined aquifer: see) aquifer (see under Confined versus unconfined)
 * conformal fuel tank (CFT)
 * (Conférence générale des poids et mesures [CGPM]) General Conference on Weights and Measures (CGPM, never GCWM)
 * (congestion [traffic]) traffic congestion
 * (congestion charge: see) road pricing (congestion pricing)
 * (coniferous forest: see) temperate coniferous forests
 * connate fluids (see "hydrocarbon prospectivity" under Significance)
 * Connections 2030 (transportation project) (in Wisconsin in the US)
 * conotoxin (see "venom" in paragraph 1)

Cons-Conse

 * consequences of the spanish flu [sic]
 * conservation agriculture
 * Conservation and Neocolonialism
 * Conservation and Research Center (in the US)
 * conservation area
 * conservation areas in Singapore
 * conservation areas of Portugal
 * Conservation Authorities Act (in Ontario in Canada)
 * Conservation Authority (in Ontario in Canada)
 * conservation biology
 * Conservation Centre Liverpool (in th UK)
 * conservation designation
 * conservation district
 * conservation easement
 * conservation ecology
 * conservation ethic
 * conservation genetics
 * Conservation Halton (in Ontario in Canada)
 * conservation headland
 * conservation in Australia
 * conservation in New Zealand
 * conservation in the Republic of Ireland
 * conservation in the United Kingdom
 * Conservation Law Foundation (CLF) (in New England in the US)
 * conservation medicine
 * conservation movement
 * conservation park (n Australia and New Zealand)
 * conservation status
 * conservation status (TNC)
 * Conservation Volunteers Australia
 * (conservationism: see) conservation ethic
 * conservationist
 * conservatory (greenhouse)
 * Conservatory of Flowers (in San Francisco in the US)
 * (conserve habitat: see) habitat conservation

Consf-Consz

 * (Constellation Observing System for Meteorology, Ionosphere, and Climate) COSMIC
 * constructed wetland
 * construction
 * construction delay
 * construction engineering
 * Construction, Forestry, Mining and Energy Union (CFMEU) (in Australia)
 * construction industry of Japan
 * construction site safety
 * Construction Today (monthly magazine)
 * (construction vehicle: see) engineering vehicle
 * Consultative Group on International Agricultural Research (CGIAR)
 * (consumer good: see) final good
 * consumerism

Cont

 * contagious bovine pleuropneumonia
 * (contagious disease: see) disease (see under Transmission of disease)
 * (contagious diseases) infectious diseases (communicable diseases)
 * container composting
 * container deposit legislation
 * container garden
 * container ship
 * container terminal
 * (contamination) pollution
 * (contiguous zone: see) territorial waters (territorial sea)
 * continental climate
 * continental crust
 * Continental Divide (Great Divide) (in North America)
 * continental drift
 * (continental glacier: see) glacier
 * continental shelf
 * continuous flow intersection (CFI)
 * (continuous permafrost: see) permafrost (see "global warming" under Permanent extent)
 * continuous-wave radar
 * contour canal
 * contour plowing (contour farming)
 * Contract Work Hours and Safety Standards Act (in the US)
 * (contraflow lane) reversible lane
 * contraflow lane reversal ("for quick emergency evacuation")
 * contrail (condensation trail) (vapor trail)
 * Control Car Remote Control Locomotive (CCRCL)
 * (Control of Electromagnetic Radiation) CONELRAD (in emergency broadcasting)
 * controlled airspace
 * controlled atmosphere (for agricultural storage)
 * controlled burn (in forest management)
 * (controlled demolition: see) demolition (see "explosives" in paragraph 3)
 * controlled explosion
 * controlled flight into terrain (CFIT) (in aviation)
 * (controlled thermonuclear fusion: see) fusion power
 * controlled-access highway
 * controller (irrigation)

Conu

 * conurbation (see also list of conurbations in the United Kingdom)

Conv-Conz

 * convection (see under Atmospheric convection and under Oceanic convection)
 * convection cell
 * convection oven
 * convective available potential energy (CAPE) (in meteorology)
 * Convention for the Conservation of Antarctic Marine Living Resources
 * Convention for the Conservation of Antarctic Seals
 * Convention on Biological Diversity (adopted in 1992)
 * Convention on Certain Conventional Weapons
 * Convention on Environmental Impact Assessment in a Transboundary Context
 * Convention on Fishing and Conservation of Living Resources of the High Seas
 * Convention on Long-Range Transboundary Air Pollution
 * (Convention on Road Traffic: 1 meaning selected from disambiguation page)
 * Vienna Convention on Road Traffic
 * Convention on the Conservation of European Wildlife and Natural Habitats
 * Convention on the International Trade in Endangered Species of Wild Flora and Fauna (CITES)
 * Convention on the Prevention of Marine Pollution by Dumping Wastes and Other Matter
 * Convention on the Prohibition of Military or Any Other Hostile Use of Environmental Modification Techniques
 * (Convention on the Prohibition of the Development, Production and Stockpiling of Bacteriological [Biological] and Toxin Weapons and on their Destruction) (BWC) Biological Weapons Convention
 * (Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction) Chemical Weapons Convention
 * (Convention on the Territorial Sea and Contiguous Zone) United Nations Convention on the Law of the Sea
 * (Convention on Wetlands of International Importance Especially as Waterfowl Habitat) Ramsar Convention
 * (conventional wastewater treatment: 4 meanings selected from disambiguation page)
 * sewage treatment
 * industrial wastewater treatment
 * agricultural wastewater treatment
 * (radioactive waste treatment: see) radioactive waste
 * (convergent plate boundary: see) plate tectonics (see under Convergent (destructive) boundaries)
 * (conveyor transport: 2 meanings selected from disambiguation page)
 * conveyor belt (belt conveyor)
 * escalator

Coo

 * (cooker: see) stove
 * cooking on a campfire
 * (cooking pit) earth oven
 * cool roof
 * cooler
 * (cooling fan: see) fan (implement)
 * cooling pond
 * cooling tower
 * (cooling water: see) watercooling
 * cooperative (see under Agricultural cooperative)
 * (cooperative cycling: see) vehicular cycling (see paragraph 2 in preamble)
 * cooperative farming
 * Cooperative Institute for Arctic Research
 * Cooperative Institute for Atmospheric Sciences and Terrestrial Applications (CIASTA)
 * Cooperative Institute for Climate and Ocean Research (CICOR)
 * Cooperative Institute for Climate Applications and Research (CICAR)
 * Cooperative Institute for Climate Science (CICS)
 * Cooperative Institute for Limnology and Ecosystems Research (CILER)
 * Cooperative Institute for Marine and Atmospheric Studies (CIMAS)
 * Cooperative Institute for Mesoscale Meteorological Studies (CIMMS)
 * Cooperative Institute for Research in Environmental Sciences (CIRES)
 * Cooperative Institute for Research in the Atmosphere (CIRA)
 * Cooperative Research Centres (in Australia)
 * Cooperative Wheat Research and Production Program

Cop-Coq

 * copper (see under Biological role)
 * copper(I) cyanide (copper cyanide) (cuprous cyanide) (cupricin)
 * coppicing
 * coprolite ("fossilized feces")
 * (coprology) scatology ("the study of feces")
 * coprophagia (dung eating)

Cor-Corm

 * coral (see under Environmental effects on coral)
 * (coral atoll: see) atoll
 * coral biology
 * coral bleaching
 * coral calcium
 * (coral dive sites: see) diving locations
 * coral reef (see under Threats to Reefs and under Protection and restoration of reefs)
 * coral sand (see under Environmental issues)
 * Coral Sea (near Australia)
 * Coral Sea Islands ("administered by the Australian Department of the Environment")
 * Coral World (marine park) (in the U.S. Virgin Islands)
 * cordgrass (see under Cultivation)
 * cordillera
 * Cordilleran Ice Sheet
 * (core meltdown: see) nuclear meltdown
 * core-mantle boundary
 * Coriolis effect
 * Cork Harbour (in Ireland)
 * cormorant (see "exploited ... fishing skills" in paragraph 2 of preamble)

Corn-Corz

 * corn and pellet stoves and furnaces (for renewable energy)
 * corn construction
 * (corn earworm: see) Helicoverpa zea ("major agricultural pest")
 * (corn pellet stove: see) stove (see under Modern corn, pellet or biofuel stove)
 * corn smut (disease of maize, caused by a fungus)
 * Cornell High Energy Synchrotron Source (CHESS) (in New York state in the US) (see "biohazard" under History)
 * Cornell Lab of Ornithology (in New York in the US) (see "BirdSource Project" in paragraph 1 and see "ivory-billed woodpecker" in paragraph 3)
 * corona (meteorology)
 * coronal mass ejection (CME) (solar event)
 * Coronaviridae ("a family of viruses")
 * Coronavirus ("a genus of animal virus") (see under Recent discoveries of novel human coronaviruses)
 * Corot (space mission) (COnvection ROtation and planetary Transits) (to search for extra-solar planets)
 * Corporate Average Fuel Economy (CAFE) (in the US)
 * corporate crime (see "damage to the environment" in paragraph 1)
 * corporate farming (see under Genetic engineering)
 * corporate malfeasance
 * corporate manslaughter (see "health and safety" under#corporate manslaughter#Discussion|Discussion]])
 * (corpse flower: see) Rafflesia ("The flowers smell like rotting meat, ...")
 * Corroboree frog ("critically endangered")
 * corrosion
 * corrosion inhibitor
 * Corsican montane broadleaf and mixed forests
 * cortex (archaeology)

Cos-Cot

 * cosmetics (see under Ingredients)
 * (cosmetic testing on animals: see) animal testing (see under Cosmetic testing on animals)
 * COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate)
 * Cosmic Anisotropy Telescope (CAT)
 * (Cosmic Background Explorer) COBE ("to investigate the cosmic background radiation" etc.)
 * cosmic microwave background experiments
 * cosmic microwave background radiation (CMB) (CMBR) (CBR) (MBR)
 * cosmic noise
 * cosmic ray (see under Lightning)
 * Cosmic Ray Deflection Society
 * (cosmic X-ray: see) X-ray astronomy
 * Cosmochemical Periodic Table of the Elements in the Solar System
 * cosmochemistry
 * (cosmodrome: see) spaceport
 * (cosmonaut: see) astronaut
 * (cosmonautics) astronautics
 * (cosmosphere: see) Kansas Cosmosphere and Space Center (in the US)
 * cotton (see under Production)
 * (cotton plantation: see) plantation
 * Cotwall End Nature Reserve (in the UK)

Cou-Coz

 * coulee ("a deep steep-sided ravine formed by erosion")
 * Council for a Livable World (in the US)
 * Council for National Parks (in the UK)
 * Council of State and Territorial Epidemiologists (CSTE) (in the US)
 * Council on Bioethics (in the US)
 * Council on Environmental Quality (CEQ) (in the US)
 * Council on Tall Buildings and Urban Habitat (CTBUH) (in Chicago the US)
 * countries affected by the 2004 Indian Ocean earthquake
 * countries with the most highrise buildings
 * country fire service (CFS) (in Australia)
 * country park
 * country parks and conservation in Hong Kong
 * Countryside Agency (in England)
 * Countryside and Rights of Way Act 2000 (in the UK)
 * Countryside Commission (in England)
 * Countryside Council for Wales (CCW) (Welsh: Cyngor Cefn Gwlad Cymru) (CCGC)
 * coupled human-environment system
 * courtyard
 * cove ("generally a circular or round inlet with a narrow entrance")
 * cove lighting
 * covenant running with the land
 * covered bridge
 * coversand
 * (cow bomb: see) exploding cow
 * cow chip ("a flat, round, hard piece of cow feces")
 * cow dung ("the feces of the bovine species")
 * (cowbane) Cicuta virosa (see "cicutoxin" in paragraph 3)
 * (cowcatcher) pilot (locomotive)
 * (Cowgate fire, 2002) Edinburgh Cowgate fire, 2002 (in Scotland in the UK)
 * cowpie (cow pie) ("a colloquialism for bovine feces")
 * cowpox
 * (cow's milk: see) milk
 * Coxsackie virus
 * Coxsackie B4 virus
 * coyote (sometimes found in suburban areas)

Cr-Crm

 * Crab-eating Macaque ("a possible vector for monkeypox")
 * cracking (chemistry) (applied in petroleum geology)
 * craftivism
 * crag and tail (in glaciology)
 * (crater: 4 meanings selected from disambiguation page)
 * impact crater
 * volcanic crater
 * caldera
 * subsidence crater
 * crater lake
 * crawling water beetle ("an endangered species")
 * (crawlspace: see) basement (see under Drainage considerations)
 * (creek: see) stream
 * creek (tidal)
 * cremation (see under Environmental reasons)
 * creosote (see under Health effects)
 * crepuscular rays (in atmospheric optics)
 * (crescent moon: see) lunar phase
 * crevasse (in glaciology)
 * (critical/endangered: see) ecoregion conservation status
 * critical area (of an airport)
 * Critical Mass (bicycle)
 * (critically endangered: see) endangered species
 * (criticisms of veganism: see) veganism (see under Criticism and controversy)

Crn-Cru

 * crocodile (see under Danger to humans)
 * (crop breeding: see) plant breeding
 * crop circle
 * (crop duster: see) agricultural aircraft
 * crop insurance
 * crop residue
 * crop rotation
 * crop yield
 * (cropland: see) farm
 * (cropsharing: see) community-supported agriculture (see "ecological, organic or biodynamic farming methods" in paragraph 1 under The CSA System)
 * cross sea
 * (cross-fertilization: see) heterosis
 * (cross-pollination: see) pollination (see under Pollination in agriculture)
 * crossbreeding
 * crossroads (culture)
 * crossroads village
 * crown land
 * cruelty to animals
 * cruelty-free
 * cruise ship (see "hurricane Katrina" in last paragraph)
 * crust (geology)

Crv-Crz

 * cryobiology ("the study of living organisms, organs, biological tissues or biological cells at low temperatures")
 * cryobiosis
 * cryogenic fuel
 * cryogenics
 * cryonics
 * cryopreservation
 * cryoprotectant
 * (cryosols: see) gelisols
 * cryosphere
 * cryovolcano
 * cryptic species complex
 * cryptobiosis
 * cryptobiotic soil
 * (cryptodepression: see) Skadar Lake (in Serbia and Montenegro and in Albania) (see paragraph 2)
 * cryptoexplosion
 * cryptosporidiosis (parasitic disease)
 * Cryptosporidium (genus of parasites)
 * (crystal methamphetamine: see) methamphetamine (see under Production)
 * (crystalline water) ice

Cs-Ct

 * CS gas (tear gas) (see under Risks to health)
 * CTC off-road trail grades (for cycling) (in the UK)

Cu-Cum

 * Cuban Missile Crisis (Caribbean Crisis) (October Crisis) (climaxing in October 1962)
 * Cuban Tree Frog ("invasive species")
 * cultivar (see "genetic engineering" under Legal points)
 * (cultivation) tillage
 * (cultivation of the land) agriculture(see under Environmental problems)
 * cultivator
 * cultural ecology
 * cultural landscape
 * (culture [microbiology]) microbiology
 * cultured pearl
 * cumulonimbus (see under Effects)
 * (cumulonimbus with mammatus: see) mammatus cloud
 * (cumulonimbus with pileus: see) pileus (meteorology)
 * cumulus castellanus cloud
 * cumulus cloud
 * cumulus congestus cloud
 * cumulus humilis cloud
 * cumulus mediocris cloud

Cun-Cuz

 * (cup anemometer: see) anemometer (see under Cup anemometers)
 * curb cut (dropped kerb)
 * curb extension
 * curb ramp
 * curb weight (kerb weight)
 * (curbside recycling) kerbside recycling
 * Curculionidae ("true" weevils) (see "subgroups of Curculionidae")
 * Curculioninae (see "boll weevil")
 * (Curculionoidea: see) weevil ("destructive to crops")
 * curie (Ci) (a former unit of radioactivity)
 * Curie Institute (Paris)
 * Curie Institute (Warsaw)
 * (Curie, Marie) Marie Curie (Maria Sklodowska-Curie) (chemist and pioneer in radiology)
 * current (electricity) (see under Electromagnetism and under Electrical safety)
 * current (fluid)
 * Current Population Survey (CPS) (in the US)
 * current science and technology events
 * current solar income
 * current sources and sinks (of electricity)

Cy-Cz

 * cyanide (see under Mining and under Fishing)
 * (cyanide process) gold cyanidation (MacArthur-Forrest process) (see under Controversy)
 * cyanobacteria (see "cyanotoxins" under Other)
 * cyber-terrorism
 * cyborg (cybernetic organism)
 * cycad (type of seed plant) (see under Conservation)
 * cycle (with a list of many kinds of cycle, including many which are relevant to the environment) (see also list of cycles)
 * (cycle courier) bicycle messenger
 * cycle facilities at roundabouts
 * (cycle helmet) bicycle helmet (see under Do helmets reduce fatalities or serious injuries?)
 * (cycle lane: see) segregated cycle facilities
 * (cycle lane debate: see) bike lane debate
 * cycle of erosion (in geology)
 * cycle rickshaw (pedicab) (velotaxi) (trishaw)
 * (cycleway: see) segregated cycle facilities (see also list of cycleways)
 * Cycleway in Bogota (Ciclovia) (in Colombia)
 * cycleways in England
 * cycleways in Wales
 * cycling
 * cycling advocacy
 * cycling gloves
 * cycling hand signals
 * cyclist
 * cyclone
 * cyclone furnace (a type of coal combustor)
 * (cyclone preparedness: see) hurricane preparedness
 * cyclonic separation (method of removing particles from an air or gas stream)