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


 * M

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: M-Mac | Mad-Maf | Mag | Mah-Mak | Mal-Mam | Man | Mao-Maq | Mar-Marh | Mari-Marim | Marin-Marind | Marine - Marine m | Marine n - Marine z | Marinea-Marizzz | Marj-Marr | Mars | Mart-Marz | Mas | Mat | Mau-Maz | Mb-Md | Me-Mea | Meb-Mec | Med | Mee-Mek | Mel-Meq | Mer | Mes | Met-Metd | Mete | Metf-Metq | Metr | Mets-Metz | Meu-Mez | Mf-Mh | Mi-Mib | Mic-Micq | Micr | Mics-Micz | Mid-Mik | Mil | Mim | Min-Minh | Mini-Minir | Minis | Minj-Minz | Mio-Mir | Mis | Mit-Miz | Mj-Mn | Mo-Moi | Moj-Mom | Mon | Moo-Moq | Mor-Mos | Mot | Mou | Mov-Moz | Mp-Mt | Mu-Muk | Mul | Mum-Mur | Mus | Mut-Muz | Mv-Mz

M-Mac

 * Maasai (Masai) (a semi-nomadic people in Africa)
 * macadam (a type of road construction)
 * The MacDiarmid Institute for Advanced Materials and Nanotechnology (the MacDiarmid Institute) (in New Zealand)
 * Mach number (Ma)
 * machine
 * (machine reproduction: see) clanking replicator
 * Mackenzie Valley Pipeline Inquiry (in Canada)
 * MacRitchie Reservoir (in Singapore)
 * macro-engineering (macroengineering) (macro engineering)
 * macroecology
 * macroinvertebrate
 * (macromolecular chemistry) polymer chemistry
 * macrosonics

Mad-Maf

 * (mad cow disease) bovine spongiform encephalopathy (BSE)
 * Madagascar lowland forests
 * Madagascar subhumid forests
 * Madeira Wind Birds (eco-tourism company)
 * Madrean pine-oak woodlands
 * Madrean sky islands
 * maelstrom

Mag

 * Magellanic subpolar forests
 * Magnaporthe grisea (rice blast fungus)
 * magnet (see under North/South Pole designation and the Earth's magnetic field)
 * magnetic fusion energy (MFE)
 * magnetic polarity reversal
 * magnetic refrigeration
 * magnetic resonance imaging (MRI) (magnetic resonance tomography [MRT])
 * magnetic sail (magsail)
 * magnetic storm (geomagnetic storm)
 * magnetic weapon
 * magnetism (see under Nano-Structured Magnets)
 * magnetite
 * Magnetohydrodynamic drive (MHD propulsor)
 * (magnetohydrodynamic generator) MHD generator (MHD dynamo)
 * magnetohydrodynamics (MHD)
 * magnetometer
 * magnetopause
 * magnetosheath
 * magnetosphere (see also list of satellites which have provided data on the magnetosphere)
 * magnetostriction
 * magnox (obsolete type of nuclear power reactor)

Mah-Mak

 * Maharashtra Pollution Control Board (in India)
 * (maidenhair tree) ginkgo ("a unique tree with no living relatives")
 * mail rocket
 * mailbomb (mail bomb) (parcel bomb) (letter bomb)
 * mains electricity
 * mains hum (electric hum)
 * (mains plugs: see) domestic AC power plugs and sockets
 * maize (corn) ("widely cultivated throughout the world")
 * major coal producing regions
 * major stationary source
 * major submarine incidents since 2000
 * Makara Peak Mountain Bike Park (in New Zealand)

Mal-Mam

 * Malabar Coast moist forests
 * (Malagasy rats and mice) Nesomyinae
 * malaria
 * malaria and the Caribbean
 * malarial parasite
 * Malawian food crisis
 * (Malayan Nature Society [Singapore Branch]: renamed) Nature Society (Singapore)
 * Malaysian Nature Society
 * Mallet locomotive
 * Malthusian catastrophe (Malthusian check)
 * Malthusianism
 * mammal
 * mammoth
 * Mammoth Cave National Park (in Kentucky)
 * (Mammoth Hot Springs: see) geothermal areas of Yellowstone
 * Mammoth Mountain (in California)
 * Mammoth Spring (in Arkansas)

Man

 * man-eating tree
 * (man-made diamond) synthetic diamond
 * (man-made disaster: see) Category:Man-made disasters
 * (man-made disease: see) bioterrorism
 * (man-made island) artificial island
 * (man-made lake: see) reservoir (water)
 * (managed lanes: see) high-occupancy vehicle (HOV)
 * management systems for road safety
 * Managing Urban America (book)
 * Manantali Dam (in Mali)
 * Manapouri Power Station (in New Zealand)
 * Manas National Park (in India)
 * (Manchester air disaster: see) British Airtours Flight 22M
 * Manchester Ship Canal (MSC) (in the UK)
 * Manchukuo and Mengchiang (agriculture, farming, lumber and fishing)
 * mandatory labelling
 * Mandla Plant Fossils National Park (in India)
 * mandrake (plant) (see under Anæsthesia)
 * mangrove (soil retainer, wildlife habitat, windbreak, breakwater) (see also list of mangrove ecoregions)
 * Manhattan Project (Manhattan Engineering District)
 * manhole (maintenance hole)
 * manhole cover
 * manhole cover theft
 * Manifesto for a Sustainable Society
 * Manila hemp (manilla) (type of fiber)
 * Manila paper
 * (manioc) cassava (see under Uses and under Cassava pests)
 * (Manistee National Forest: see) Huron-Manistee National Forests (in Michigan)
 * Manitoulin Island (in Ontario)
 * Manned Orbiting Laboratory (MOL)
 * (Manned Space Programs: see) list of human spaceflights by program
 * (Manned Spacecraft Center: see) Lyndon B. Johnson Space Center ("JSC") (see also list of manned spacecraft)
 * (manned spaceflight) human spaceflight
 * (see also list of manned spaceflights to the ISS [ISS = International Space Station])


 * manometer
 * manta ray (giant manta) (Atlantic manta) (Pacific manta) (devil ray) (devilfish) (manta)
 * mantle (geology)
 * mantle plume
 * (manufactured diamond) synthetic diamond
 * (manufactured gas) town gas
 * manufactured housing (prefab housing)
 * manufacturing
 * (Manufacturing Belt) Rust Belt (in the US)
 * manufacturing resource planning (MRP II)
 * (manufacturing waste) industrial waste
 * manure

Mao-Maq

 * (Maori wrasse) humphead wrasse (endangered fish)
 * map
 * maple (source of wood and syrup for humans, and of pollen and nectar for bees)
 * maple bug (boxelder bug)
 * Maquila Decree
 * maquiladora (maquila) ("health and environmental problems have arisen")
 * Maquila Solidarity Network (MSN)
 * Maquis shrubland

Mar-Marh

 * Marathon Ashland Petroleum (from 2005-09-01, Marathon Petroleum Company)
 * Marathon Oil Corporation
 * Marble Bar, Western Australia ("believed by some to be the world's hottest place")
 * Marburg virus
 * March 2006 Tornado Outbreak Sequence
 * March 2007 floods in the Argentine littoral
 * March 2007 Sumatra earthquakes (in Indonesia)
 * March of the Penguins (documentary)
 * Marchioness disaster
 * (Marconi's Wireless Telegraph Company: see) Guglielmo Marconi
 * Marek's disease (in chickens)
 * marginal propensity to consume (MPC)
 * marginal propensity to save (MPS)
 * marginal sea

Mari-Marim

 * Marie Curie (Maria Sklodowska-Curie) (chemist and pioneer in radiology)
 * (marijuana: see) cannabis (drug) (listed because of environmental effects of cultivation)

Marin-Marind

 * marina
 * Marina Beach (in India)

Marine - Marine m

 * marine aquarium
 * (marine aquarium fish species: see) list of marine aquarium fish species
 * marine biology
 * (Marine Biology Simulation Case Study [MBSCS]: see) Advanced Placement Computer Science
 * marine biomolecule
 * marine clay
 * marine conservation
 * (marine dead zone: see) dead zone
 * marine debris
 * (Marine Dumping: see) Convention on the Prevention of Marine Pollution by Dumping Wastes and Other Matter
 * (marine ecology: see) marine biology
 * marine ecoregion
 * marine engineering
 * (marine farming: see) aquaculture
 * (marine geology: see) oceanography
 * (marine life: see) marine biology
 * (Marine Life Conservation: see) Convention on Fishing and Conservation of Living Resources of the High Seas
 * marine life of New York Harbor
 * marine mammal
 * Marine Modeling and Analysis Branch (MMAB) (in the US)

Marine n - Marine z

 * Marine Nature Reserve (MNR) (in the UK)
 * marine park
 * marine pollution
 * Marine Protected Area
 * (Marine Protected Areas of the United States: see) National Marine Protected Areas Initiative
 * (marine reptile: see) list of marine reptiles
 * marine reserve
 * marine reserves of New Zealand
 * marine science
 * (marine slip) slipway (boat skip) (slip)
 * marine snow
 * (marine transport: see) ship transport
 * (marine west coast climate: see) oceanic climate (maritime climate)
 * (Marine World: renamed) (Marine World Africa USA: renamed) (Marine World Theme Park: renamed) Six Flags Marine World (in California)
 * marine worm
 * Marine Worm Harvester
 * (marine zoology: see) marine biology

Marinea-Marizzz

 * Marineland
 * (maritime: see) sea
 * Maritime archaeology
 * (maritime climate) oceanic climate (marine west coast climate)
 * maritime geography
 * maritime terrorism
 * (maritime transport: see) ship transport

Marj-Marr

 * Mark 117 bomb
 * Mark 118 bomb
 * Markermeer (in the Netherlands)
 * (Markerwaarddijk: see) Zuiderzee Works
 * market garden
 * market gardening
 * Marmaray (tunnel under the Bosporus) (in Turkey) ("to be finished in 2010")
 * marmoset (member of one of several species of monkeys)
 * marmot (member of one of several species of rodents)
 * Marquesas botany
 * Marquesas zoology
 * Marquis reagent

Mars

 * Mars Climate Orbiter
 * (Mars colonization) colonization of Mars
 * Mars Desert Research Station (MDRS)
 * (Mars Direct: see) The Case For Mars: The Plan to Settle the Red Planet and Why We Must (book)
 * (Mars exploration) exploration of Mars
 * Mars Exploration Rover (MER)
 * Mars Express
 * Mars Express Orbiter
 * Mars Global Surveyor (MGS)
 * Mars Gravity Biosatellite
 * Mars Habitat Unit
 * (Mars meteorite) Martian meteorite
 * Mars Observer
 * (Mars Odyssey: see) 2001 Mars Odyssey
 * Mars Pathfinder
 * (Mars Phoenix: see) Phoenix (spacecraft)
 * Mars Polar Lander
 * Mars probe program
 * Mars Radiation Environment Experiment (Martian Radiation Experiment) (MARIE)
 * Mars Reconnaissance Orbiter (MRO)
 * Mars Rover
 * (Mars Sample Return: see) exploration of Mars
 * Mars Science Laboratory (or MSL)
 * Mars Society
 * Mars Surveyor
 * Mars Telecommunications Orbiter
 * marsh
 * (marsh gas: see) natural gas
 * Marsh test (for detecting arsenic)
 * (marshalling yard) classification yard
 * marsupial

Mart-Marz

 * (Martinique Giant Rice Rat: see) Antillean Giant Rice Rat
 * Marwell Zoological Park
 * Maryland Conservation Council (MCC)

Mas

 * (mass burial: see) mass grave
 * mass concentration (mascon )
 * mass deacidification (of paper in old books)
 * mass decontamination (mass decon)
 * mass grave
 * mass production
 * Mass Rapid Transit
 * Mass Rapid Transit (Singapore) (MRT)
 * (Mass Rapid Transit [Taipei]: see) Taipei Rapid Transit System (TRTS)
 * (Mass Rapid Transit Authority of Thailand [MRTA]: see) Bangkok Metro
 * mass spectrometry
 * (mass transit) Public transport (public transportation) (public transit)
 * mass transit in Bucharest
 * mass transit in Chicago
 * mass transit in New York City
 * (Mass Transit Railway) MTR (in Hong Kong)
 * (Mass Transit Railway Corporation Limited) MTR Corporation Limited (MTRC) (in Hong Kong)
 * (mass transportation) public transport (public transportation) (public transit) (mass transit)
 * mass wasting (in geology)
 * (mass-energy equation) E=mc²
 * Massachusetts Bay Transportation Authority (MBTA)
 * Massachusetts Water Resources Authority (MWRA)
 * Massasauga Rattlesnake (threatened)
 * (massic energy: see) energies per unit mass
 * (master-planned community: see) new town
 * mastodon

Mat

 * Mata Atlântica (in Brazil) ("contains a large number of highly endangered species")
 * material
 * material safety data sheet (MSDS)
 * Materials Recovery Facility (MRF)
 * Materials Research Science and Engineering Centers (MRSEC)
 * materials science
 * mathematical biology (biomathematics)
 * mathematical chemistry
 * mathematical physics
 * Matheson Fire (in Canada)
 * (Matilda Highway) Landsborough Highway (in Australia)
 * mating
 * mating pool
 * (mating season: see) estrus cycle (estrous cycle)
 * mating system
 * Matobo National Park (in Zimbabwe)
 * matorral (shrubland)
 * Matsumoto incident (in Japan)
 * (matter-energy relation: see) E=mc²
 * Matthews Range (Mathews Range) (Lenkiyio Hills) (in Kenya)

Mau-Maz

 * Maui Ocean Center (in Hawaii)
 * Maui gas field (in New Zealand)
 * Mauna Kea (in Hawaii)
 * Mauna Kea Observatory
 * Mauna Loa (in Hawaii)
 * Mauna Loa Observatory (MLO)
 * Mauna Loa Solar Observatory (MLSO)
 * Max Planck (Max Karl Ernst Ludwig Planck) (physicist)
 * (Max Planck Institute) Max-Planck-Gesellschaft
 * Max Planck Institute for Bioinorganic Chemistry
 * Max Planck Institute for Biophysical Chemistry
 * Max Planck Institute of Biochemistry
 * maximum sustainable yield (MSY) (in fisheries science)
 * (Maxwell's theory of electromagnetism: see) electromagnetism
 * May 1965 Tornado Outbreak Sequence
 * May 1995 tornado outbreak sequence
 * May 2003 Tornado Outbreak Sequence
 * May 2006 Java earthquake (near Yogyakarta)
 * May 2007 Tornado Outbreak
 * May 22, 1981 Tornado Outbreak
 * May 8th 1995 Louisiana Flood
 * (May bug) cockchafer ("pest")
 * Mayani bird sanctuary (in India)
 * Mazon Creek fossils (near Chicago)

Mb-Md

 * (McCormick reaper: see) Mazon Creek fossils
 * McDonald's (see under Criticism)

Me-Mea

 * mealworm ("food source" for "pets")
 * (mealworm beetle: see) darkling beetle
 * mealybug (pest)
 * mean flow
 * mean high water springs
 * mean Radiant Temperature (MRT)
 * (mean sea level MSL: see) sea level
 * (mean solar time: see) solar time
 * (mean tropical year: see) tropical year
 * means of production
 * means of protection
 * measurement
 * (Measurements of Pollution in the Troposphere) MOPITT
 * measuring instrument
 * (measuring well-being: see) quality of life
 * meat (see also list of meat animals)
 * meat analogue (meat analog)
 * meat and bone meal (MBM)
 * (meat industry: see) livestock
 * Meat Inspection Act
 * meat packing industry
 * (meat recovery system: see) advanced meat recovery (AMR)

Meb-Mec

 * mechanical advantage (MA)
 * mechanical biological treatment (MBT)
 * mechanical efficiency
 * mechanical energy
 * mechanical engineering
 * mechanical equivalent of heat
 * mechanical heat treatment (MHT)
 * mechanical plant (physical plant)
 * mechanical work
 * mechanically separated meat (MSM) (mechanically recovered meat [MRM])
 * mechanically separated poultry (MSP)
 * mechanics
 * mechanised agriculture
 * mechanochemistry

Med

 * (median [highway]: see) central reservation
 * (median strip: see) central reservation
 * mediation (biology)
 * medical geology
 * medical cannabis
 * (medical nanorobotics: see) nanomedicine
 * (medical nanotechnology: see) nanomedicine
 * medical tourism
 * medical waste
 * Medical Waste Tracking Act
 * medicinal chemistry
 * medicinal leech
 * (medicinal plant: see) botany
 * medicinal tea
 * medieval hunting
 * Medieval Warm Period (MWP) (Medieval Climate Optimum) (Medieval Climatic Anomaly)
 * Mediterranean Basin
 * Mediterranean climate
 * Mediterranean forests, woodlands, and shrub
 * Mediterranean Monk Seal ("endangered")
 * Mediterranean recluse spider (introduced to the US)
 * mediterranean sea (in oceanography)
 * Mediterranean Sea
 * (medium earth orbit [MEO]: see) intermediate circular orbit (ICO)
 * medium-density fibreboard (MDF) ("use of formaldehyde resins")

Mee-Mek

 * megacity (megapolis) (megalopolis)
 * megacryometeor
 * megafauna
 * megamammals
 * megalopolis
 * megascale engineering
 * megastructure
 * megathermal (macrothermal)
 * megathrust earthquake
 * megatsunami
 * megawatt (MW)
 * megawatt-hour (MW·h)

Mel-Meq

 * melting
 * melting point
 * melting points of the elements (data page)
 * (member [geology]: see) stratum
 * Memphis Area Transit Authority (MATA)
 * (Mendel: see) Gregor Mendel ("father of genetics")
 * Mendel University of Agriculture and Forestry Brno (in the Czech Republic)
 * (Mendeleev: see) Dmitri Mendeleyev (Russian chemist)
 * (Mendeleev periodic table) periodic table
 * Mendeleev's predicted elements
 * meningitis (see under Causative organisms)

Mer

 * Mer Bleue Conservation Area (in Ontario, Canada)
 * Mercator projection
 * merchandization
 * mercury (element) (see under Health and Environmental Effects)
 * mercury-in-glass thermometer
 * mercury-vapor lamp
 * Mercy Mercy Me (The Ecology) (song)
 * meridian
 * Meridian Energy Limited (in New Zealand)
 * Merlin diamond mine (in Australia)
 * Merritt Island National Wildlife Refuge (in Florida in the US)
 * (Meru [volvano]: see) Mount Meru (Tanzania) ("active volcano")

Mes

 * mesa (in geology)
 * Mesker Park Zoo (in Indiana in the US)
 * (mesopause: see) mesosphere
 * (mesopelagic zone: part of) pelagic zone
 * mesosphere
 * (mesospheric cloud: see) noctilucent cloud
 * mesothermal (in climatology)

Met-Metd

 * Met Office (previously Meteorological Office) (the UK's national weather service)
 * metabolic theory of ecology
 * metagenomics (environmental genomics) (community genomics)
 * (metal active gas [MAG] welding: see) gas metal arc welding (GMAW) (metal inert gas [MIG] welding) (see especially under Safety)
 * metal foam
 * metal fume fever
 * metal halide lamp (containg mercury and metals)
 * metallurgical engineering
 * Metallurgical Laboratory (site of the first self-sustaining nuclear reaction)
 * metallurgy
 * metalworking
 * metamaterial (in electromagnetism)
 * metamorphism (in geology)
 * metamorphosis (biology)
 * Metapneumovirus
 * metapopulation
 * metastasis
 * metavolcanic rock

Mete

 * meteor (shooting star) (falling star)
 * Meteor Crater (Barringer Crater) (in Arizona in the US)
 * (meteor impact: see) impact event
 * meteor shower (see also list of meteor showers)
 * meteorite
 * (meteorite crater: see) impact crater (impact basin) (crater)
 * (meteorite impact: see) impact event
 * meteorites classification
 * Meteoritical Society
 * meteoritics
 * meteoroid
 * meteorological history of Hurricane Katrina
 * (Meteorological Office: renamed) Met Office (the UK's national weather service)
 * meteorological phenomenon (see also list of meteorological phenomena)
 * (meteorological satellite) weather satellite
 * Meteorological Service of Canada (MSC)
 * meteorology (see also list of meteorology topics)

Metf-Metq

 * methamphetamine (see under Production)
 * methane
 * methanogen
 * methanogenesis
 * methanol
 * (methanol car: see) liquid fuels
 * methanol chemdata supplement
 * methanol economy
 * (methanol fuel: see) liquid fuels
 * (methanol fuel cell: see) direct-methanol fuel cell (DMFC)
 * Methicillin-resistant Staphylococcus aureus (MRSA) ("superbug")

Metr

 * metric system
 * metric system in the United States
 * metrication (metrification)
 * (metro: see) rapid transit
 * Metro Toronto and Area Conservation Authority (MTACA)
 * Metrobus
 * Metrology
 * metropolis
 * metropolitan area (see also)
 * list of metropolitan areas by population
 * list of the 100 largest metropolitan areas in Canada
 * list of the 20 largest metropolitan areas of Italy
 * list of the largest metropolitan areas in Africa
 * list of the largest metropolitan areas in the Americas
 * list of United States metropolitan areas
 * Metropolitan Transit
 * (Metropolitan Transit Authority) MTA
 * Metropolitan Transit Authority of Harris County, Texas (METRO)
 * (Metropolitan Transit Authority of New York City: see) New York City Transit Authority (NYCTA) (NYCT) (the TA)
 * Metropolitan Transit Commission
 * (Metropolitan Transportation Agency [MTA]: see) Agence métropolitaine de transport (AMT)
 * Metropolitan Transportation Authority (New York)
 * Metropolitan Transportation Commission (San Francisco)
 * Metropolitan Travel Survey Archive
 * Metropolitan Water District of Southern California

Meu-Mez

 * (Meudon Observatory: see) Paris Observatory (Observatoire de Paris) (Observatoire de Paris-Meudon)
 * Mexican Free-tailed Bat (very important for pest control) (see paragraph 5)
 * Mexican Wolf (conservation status: critical [Wikipedia's term]; critically endangered [IUCN's term] [CR])
 * Mexico City (see under Urban Problems)

Mi-Mib

 * Miami Tornado (of May 12, 1997)
 * Miami tornadoes of 2003
 * Miami-Dade Transit

Mic-Micq

 * Michael Faraday (a British scientist--a physicist and chemist)
 * Michigan left (Michigan left turn) (Superstreet)

Micr

 * (micro [transport]: see) public transport in Lima
 * Micro Air Vehicle (MAV)
 * (Micro Combined Heat and Power) MicroCHP
 * (Micro Electro-Mechanical Systems) MEMS
 * (micro-hydropower: see) hydropower (see under Small scale hydro power)
 * (microballoon) glass microsphere
 * microbial ecology
 * microbial fuel cell (biological fuel cell)
 * microbicide
 * microbiology
 * microbolometer (for measuring electromagnetic radiation)
 * microcar
 * microchip (animal identification)
 * microclimate
 * microorganism (microbe)
 * (micropower broadcasting) low-power broadcasting (microbroadcasting)
 * microelectronics
 * microfiber
 * microfiltration
 * (microgravity: see) weightlessness
 * microgravity environment
 * (microhabitat: see) habitat (ecology)
 * micromachinery
 * microscope
 * microsound
 * microspacecraft
 * Microtechnology
 * (microturbine: see) gas turbine (see under Micro turbines)
 * microwave (radiation)
 * microwave auditory effect ("Frey effect")
 * (microwave background radiation: see) cosmic microwave background radiation (CMB)
 * microwave chemistry
 * microwave effect
 * (microwave laser: see) maser
 * microwave oven (see under Safety and controversy)
 * microwave plasma
 * microwave power meter
 * microwave power transmission (MPT)
 * microwaving

Mid-Mik

 * Mid-Atlantic Ridge
 * Mid-Atlantic United States flood of 2006
 * Mid-Continent Oil Province (in the US)
 * mid-December 2007 eastern Canada winter storm
 * mid-December 2007 North American Winter storms (in North America)
 * Mid-InfraRed Technologies for Health and the Environment (MIRTHE) (largely based at Princeton University in the US)
 * mid-June 1992 Tornado Outbreak (in the US)
 * Mid-Mississippi Valley Tornado Outbreak of March 1890 (in the US)
 * mid-November 2005 Tornado Outbreak (in the US)
 * mid-November 2006 tornado outbreak (in the US)
 * mid-ocean ridge (mid-oceanic ridge)
 * mid-October 2007 Tornado Outbreak
 * mid-size car
 * midden (kitchen midden)
 * middle latitudes
 * midnight
 * (migrating birds: see) bird migration
 * migration
 * Migratory Bird Treaty Act of 1918
 * migratory locust

Mil

 * Milan Transportation System (in Italy)
 * Milankovitch cycles (in climatology)
 * Millau Viaduct (le Viaduc de Millau) (in France) ("the tallest vehicular bridge in the world")
 * mildew ("a grey, mold-like growth")
 * mile-a-minute weed (Devil's tail tearthumb) (Asiatic tearthumb)
 * militarisation of space
 * militarism
 * military
 * military animals
 * military dolphin
 * Military Geology Unit
 * milk
 * (milkweed) Asclepias
 * mill town
 * Millennium Development Goals (by the UN) (see under Ensure environmental sustainability)
 * Millennium Ecosystem Assessment (MA)
 * miller
 * Miller cycle (in engine design)
 * (milliequivalent: see) equivalent (chemistry)
 * milligram per litre (milligram per liter) (mg/L)
 * millimeter cloud radar (millimeter wave cloud radar) (MMCR)
 * (millimeter of mercury [mmHg]) torr (unit of pressure)
 * millstone
 * Milne Ice Shelf
 * (milo maize: see) sorghum ("drought tolerant and heat tolerant")

Min-Minh

 * Minamata, Kumamoto (in Japan) (see under Minamata environmental disaster)
 * Minamata disease ("a neurological syndrome caused by severe mercury poisoning")
 * (mine: see) mining
 * (Mine Ban Treaty) Ottawa Treaty (Convention on the Prohibition of the Use, Stockpiling, Production and Transfer of Anti-Personnel Mines and on their Destruction)
 * mine closure
 * mine closure planning
 * (mine explosion: see) mining accidents
 * mine fire
 * mine plow (military)
 * mine reclamation
 * mine roller (military)
 * Mine Safety and Health Administration (MSHA) (in the US)
 * (minefield: see) landmine
 * (Miner's Safety Lamp) Davy lamp
 * mineral
 * (mineral fuel) fossil fuel
 * mineral oil
 * mineralogy
 * (miners' anaemia: see) hookworm
 * minesweeper (ship)
 * Mingan Archipelago National Park Reserve (in Quebec)

Mini-Minir

 * miniaturized satellite
 * mining (see also list of mining companies)
 * mining accident (see also list of mining disasters in Poland)
 * Mining Act of 1872 (in the US)
 * mining engineering
 * mining in Limburg
 * Mining the Sky: Untold Riches from the Asteroids, Comets, and Planets (book)
 * (minipark: see) pocket park
 * minipreparation (miniprep) ("one lab application of this ... [involves] ... antibiotic resistance")

Minis

 * minisatellite
 * Minister for Transport
 * Minister of Agriculture
 * Minister of Agriculture (Canada)
 * Minister of Agriculture, Fisheries and Food
 * Minister of Agriculture, Forestry and Fisheries (Japan)
 * Minister of Energy, Mines and Resources (Canada)
 * Minister of Fisheries and Oceans (in Canada)
 * Minister of Land, Infrastructure and Transport (Japan)
 * Minister of Natural Resources (Canada)
 * Minister of Public Safety and Emergency Preparedness (in Canada)
 * Minister of Railways and Canals (Canada)
 * (Minister of the Environment: see) list of ministers of the environment
 * Minister of the Environment (Canada)
 * Minister of the Environment (Japan)
 * Minister responsible for the Canadian Wheat Board
 * Ministry for Atomic Energy (Russian Federation)
 * Ministry for the Environment (in New Zealand)
 * Ministry of Agriculture
 * Ministry of Agriculture, Food and Rural Affairs (Ontario)
 * (Ministry of Agriculture and Forestry [in New Zealand]: see) New Zealand Ministry of Agriculture and Forestry
 * Ministry of Agriculture, Fisheries and Food (in the UK)
 * Ministry of Agriculture, Forestry and Fisheries (Japan)
 * Ministry of Energy (Ontario)
 * Ministry of Extraordinary Situations (Russian Federation) (EMERCOM) (Ministry of the Russian Federation for Civil Defense, Emergencies and the Elimination of the Consequences of Natural Disasters)
 * Ministry of Land, Infrastructure and Transport (Japan)
 * Ministry of Natural Resources (Ontario)
 * Ministry of Northern Development and Mines (Ontario)
 * Ministry of the Environment (Japan)
 * Ministry of the Environment (Ontario)
 * Ministry of Transportation (Ontario)

Minj-Minz

 * mink oil
 * Minnesota Experimental City
 * Minnesota Glacier

Mio-Mir

 * Mir Space Station (see under Names)
 * Miracle Planet (five-part documentary series)

Mis

 * miscellaneous topics on cities and population
 * (misdirected lighting: see) light pollution (photopollution) (luminous pollution)
 * mission blue butterfly habitat conservation
 * Mississippi Alluvial Plain
 * Mississippi Delta
 * Mississippi River (see under Watershed)
 * Mississippi River-Gulf Outlet Canal
 * (Missouri Plateau: see) Coteau du Missouri
 * Missouri River
 * (Missouri River Basin Project: renamed) Pick-Sloan Missouri Basin Program
 * Missouri River Trench
 * mist
 * (Misti Volcano) El Misti (in Peru)

Mit-Miz

 * miticide
 * mitigation of global warming
 * mitotoxin
 * Mitsubishi (see under Problems)
 * (mixed expressway: see) RIRO expressway
 * (mixed farming) polyculture
 * mixed oxide
 * mixed oxide fuel (MOX fuel)
 * mixed waste

Mj-Mn

 * MnDOT traffic cameras

Mo-Moi

 * (mobile garbage bin) wheelie bin
 * mobile phone (see under Environmental impacts)
 * mobile phone radiation and health
 * mobile phones on aircraft
 * (mobile power: see) power
 * Mobility 2030
 * mode of transport
 * (moderator: one meaning selected from disambiguation page)
 * neutron moderator
 * modified atmosphere (of packages) (see under Packaging Films)
 * (Mohave Desert) Mojave Desert
 * Mohring effect (in public transit systems)
 * (moist adiabatic lapse rate: see) adiabatic lapse rate (in meteorology)
 * (moist grain crimping) grain crimping
 * moisture
 * (moisture in the soil) soil moisture
 * moisture ratio

Moj-Mom

 * Mojave Desert (Mohave Desert)
 * Mojave Freeway (previous name: Barstow Freeway)
 * Mojave National Preserve
 * Mojave Spaceport (Mojave Airport and Civilian Flight Test Center)
 * Mojave phone booth (with "environmental impact")
 * Mojave yucca (see "typically grows" and see under Uses)
 * mold remediation
 * molecular biology
 * molecular ecology
 * molecular engineering
 * molecular nanotechnology (MNT)
 * molten salt reactor
 * Molten Salt Reactor Experiment
 * molten-carbonate fuel cells (MCFCs)

Mon

 * Monarch butterfly (see "drastic reduction in ... population")
 * monetary reform
 * (monk seal) Monachus
 * (Caribbean Monk Seal: "extinct")
 * (Hawaiian Monk Seal: "endangered")
 * (Mediterranean Monk Seal: "endangered")
 * monkeypox (virus)
 * Mono-Inyo Craters (in California)
 * monoculture (see under Agriculture)
 * monogenetic volcanic field
 * monopropellant
 * monorail
 * monotreme
 * Monsanto
 * Monsanto Canada Inc. v. Schmeiser
 * Monsanto Insectarium (in St. Louis in Missouri in the US)
 * (monster wave) freak wave (rogue wave)
 * montane grasslands and shrublands
 * (Monte Carlo N-Particle Transport Code) MCNP (in nuclear energy)
 * Montezuma Marsh (in New York state)
 * Montezuma National Wildlife Refuge (in New York state)
 * (Monthly Mumbai Weather: see) weather of Mumbai
 * Montreal Biodome
 * (Montreal Botanical Garden) Jardin botanique de Montréal
 * (Montreal commuter trains: see) Agence métropolitaine de transport (AMT) (Metropolitan Transportation Agency [MTA])
 * Montreal Insectarium
 * Montreal Metro (see under Trains: "Rubber tires ... less energy consumption")
 * Montreal Protocol on Substances That Deplete the Ozone Layer
 * Monument to the Great Fire of London

Moo-Moq

 * moon (see under Orbit and under Eclipses: "tides")
 * moon landing
 * (moon landing hoax: see) Apollo moon landing hoax accusations (see under Ionizing radiation and Heat)
 * moon rocks
 * moonlight
 * moonquake
 * Moorgate tube crash (in London, England)
 * Moorten Botanical Garden and Cactarium (in California)
 * moose test

Mor-Mos

 * moral purchasing
 * moray eel (see "toxin" and "fishery")
 * morgue (mortuary)
 * morphodynamics
 * (mortality rates arising out of the European colonization of the Americas: see) population history of American indigenous peoples (see under Depopulation from disease)
 * Moscow State Forest University (MSFU)
 * Moscow Zoo
 * mosquito (see under Mosquitoes and health)
 * mosquito net
 * (mosquito trap: see) bug zapper
 * moss (see under Cultivation): "considered a weed in grass lawns"

Mot

 * MOT test (of vehicles) (including "exhaust gases emission test")
 * moth (see under Economic significance of moths)
 * mothball
 * Mother Earth
 * Mother Earth News
 * Mother Nature
 * Mothers Organized to Stop Environmental Sin (MOSES) (based in Texas)
 * motor
 * motor oil
 * motor vehicle
 * (motor vehicle accident) car accident (traffic accident) (auto accident) (road accident) (road traffic accident)
 * motorcycle (motorbike) (see under Noise Pollution)
 * motorway

Mou

 * mound-building termites
 * Mount Etna ("active volcano") (in Italy)
 * Mount Everest (highest mountain on Earth) (between Nepal and Tibet)
 * Mount Meru (Tanzania) ("active volcano")
 * Mount Kilimanjaro ("volcano ... active") (in Tanzania)
 * Mount Pelée ("active volcano ... on ... Martinique in the Caribbean")
 * Mount Pinatubo ("active volcano ... in the Philippines")
 * Mount St. Helens ("active stratovolcano") (in the US)
 * Mount St. Helens National Volcanic Monument
 * Mount Weather Emergency Operations Center (in Virginia in the US)
 * mountain (see also list of highest mountains and list of mountains and list of mountain types)
 * mountain bike (mountain bicycle) (ATB) (All Terrain Bicycle) (see also list of mountain bike areas and trails in the United Kingdom and list of mountain bike trails in Wisconsin)
 * (mountain building) orogeny
 * Mountain Gorilla (Gorilla beringei beringei) ("endangered")
 * mountain pass (see also list of mountain passes and list of mountain passes in Switzerland)
 * mountain pine beetle
 * mountain range (see also list of mountain ranges)
 * mountain rescue
 * mountain unicycling (MUni)
 * mountaineering
 * mouse ("mice can ... be harmful pests")
 * mousetrap

Mov-Moz

 * (moving sidewalk) escalator (moving walkway) (slidewalk) (travelator) (travellator) (trav-o-lator) (see under Longest escalators and systems)
 * mower

Mu-Muk

 * muck (soil) (see "muck farming")
 * mud
 * mud dauber (member of one of several species of wasps)
 * (mud engineer: see) drilling mud
 * (mud nest builders) Corcoracidae (Corcorachidae?) (member of either of two species of birds)
 * mud season
 * mud volcano (mud dome)
 * mud-terrain tyre
 * mudbrick
 * mudflat
 * mudslide
 * Mugger Crocodile
 * muiri tree (an endangered species)

Mul

 * multi-purpose vehicle (MPV)
 * (multi-use path: see) segregated cycle facilities
 * multigenomic organism
 * multilevel streets in Chicago (see "sewers and proper drainage")
 * multiple chemical sensitivity (MCS) (20th Century Syndrome) (Environmental illness) (Sick Building Syndrome) (Idiopathic Environmental Intolerance) (IEI)
 * multiple cropping
 * (Multiple Mirror Telescope) MMT (in Arizona)
 * multiple-effect evaporator
 * multiplex (road) (concurrency)
 * Multipurpose Laboratory Module (MLM) (for the International Space Station [ISS])

Mum-Mur

 * (Mumbai floods of 2005) 2005 Maharashtra floods
 * Mumbai's water sources
 * Mumbai-Pune Expressway
 * mummy
 * municipal solid waste (MSW)
 * (municipal water supply: see) water supply network
 * (municipal water system: see) water supply network
 * (municycling: see) mountain unicycling (MUni)
 * (munitions dump) ammunition dump (ammunition compound) (ammo dump)

Mus

 * (Musa textilis) abacá (plant grown for its fiber)
 * muscazone (toxin)
 * National Museum of Natural History (France) (Muséum national d'histoire naturelle, MNHN) (the French National Museum of Natural History)
 * Natural History Museum, Berlin (Museum für Naturkunde, Naturkundemuseum)
 * Museum of English Rural Life (in Reading, England)
 * Museum of Garden History (in London, England)
 * Museum of Natural History ("many ... around the world")
 * mushroom (see under Chemical properties)
 * mushroom cloud (from a very large explosion)
 * (mushroom compost) spent mushroom compost
 * mushroom hunting (mushrooming)
 * mushroom poisoning
 * mushroom rocks (pedestal rocks)
 * music
 * music and the brain (see under Music in the Animal Kingdom)
 * music therapy (musicotherapy)
 * musical acoustics (music acoustics)
 * (musical aesthetics) aesthetics of music
 * musical instrument
 * musical instrument classification
 * mustard gas (HD)

Mut-Muz

 * mutagen
 * mutation (see under Causes of mutation)
 * mutual assured destruction (MAD)
 * muzak
 * muzzle (device)

Mv-Mz

 * My Inventions: The Autobiography of Nikola Tesla (book)
 * mycology (the study of fungi)
 * mycotoxin
 * Myrmecia (bull ant) (bulldog ant) (see "venom" and "painful sting" in paragraph 2)
 * myrmecology (the study of ants)