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


 * P

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: P-Pac | Pad-Pak | Pal | Pam-Pao | Pap-Paq | Par-Para | Parb-Pars | Part-Parz | Pas | Pat-Paz | Pb-Pd | Pe-Pea | Peb-Pek | Pel-Peq | Per | Pes | Pet-Petq | Petr-Petrn | Petro (separate word) | Petro (in hyphenated compound words) | Petroa-Petrok | Petrol | Petrom-Petrzz | Pets-Petz | Peu-Pez | Pf-Pg | Ph-Pha | Phb-Phn | Pho | Php-Phx | Phy-Phys | Phyt-Phyz | Phz | Pi | Pj-Pk | Pl-Plam | Plan-Plans | Plant (separate word) | Plant (in hyphenated compound words) | Planta-Plantz | Planu-Plarz | Plas | Plat-Plaz | Plb-Plt | Plu-Plz | Pm-Pn | Po-Pok | Pol-Pola | Polb-Polk | Poll | Polm-Polz | Pom-Poo | Pop | Poq-Por | Pos | Pot | Pou-Pov | Pow | Pox-Poz | Pp-Pq | Pr-Prd | Pre | Prf-Prh | Pri | Prj-Prn | Pro-Proo | Prop-Proz | Prp-Prz | Ps-Pt | Pu-Pub | Puc-Pul | Pum-Puz | Pv-Pz

Pa-Pac

 * Pachmarhi Biosphere Reserve
 * Pacific (ocean)
 * Pacific Coast Ranges
 * Pacific decadal oscillation
 * Pacific Fishery Management Council (PFMC)
 * Pacific Gas and Electric Company (PG&E)
 * Pacific Marine Environmental Laboratory (PMEL)
 * (Pacific Mountain System: see) Geography of the United States Pacific Mountain System
 * Pacific Northwest National Laboratory (PNNL)
 * Pacific Northwest Seismograph Network (PNSN)
 * Pacific Remote Islands National Wildlife Refuge Complex
 * Pacific Ring of Fire
 * Pacific temperate rain forests
 * Pacific Tsunami Warning Center
 * Pacific-Antarctic Ridge
 * (pack ice: see) sea ice
 * pack rat (trade rat) (wood rat)
 * packaging and labelling
 * packhorse bridge

Pad-Pak

 * paddle steamer (paddleboat) (paddlewheeler)
 * (paddlewheel steamboat: see) riverboat
 * paddy field
 * Padre Island National Seashore
 * paint
 * paint stripper
 * (paint thinner: see) turpentine substitute
 * (painting basic topics) list of painting topics
 * painting oil
 * Pakistan's Satellite Launch Vehicle
 * Paks Nuclear Power Plant (in Hungary)

Pal

 * paleobotany
 * paleoclimatology
 * paleoecology
 * paleoethnobotany (see also list of prominent paleoethnobotanists)
 * (paleogeography) palaeogeography
 * paleogeology
 * paleolimnology
 * paleomagnetism
 * paleontology
 * paleosol
 * paleotempestology
 * (paleowater) fossil water
 * paleozoology
 * Palestinian Environmental NGOs Network
 * Palm Sunday tornado outbreak of 1920
 * Palm Sunday tornado outbreak of 1965
 * Palm Sunday tornado outbreak of 1994
 * Palo Verde Nuclear Generating Station
 * Palomar Observatory
 * palynology
 * palytoxin

Pam-Pao

 * Panama Canal expansion proposal (see under Environmental impact)
 * Panama disease (a banana plant disease)
 * panbiogeography
 * (panda: 2 meanings selected from disambiguation page)
 * Giant Panda
 * Red Panda
 * pandemic (see also list of epidemics)
 * Pangaea
 * Pangaea Ultima

Pap-Paq

 * paper
 * paper chromatography
 * paper engineering
 * (paper mail) snail mail
 * paper mill
 * Paper Mulberry
 * (paper pulp: see) pulpwood
 * (paper recycling: see) recycling
 * paper shredder
 * paper towel
 * paper wasp
 * paperboard
 * paperless office
 * Papua New Guinea stilt house
 * papyrus

Par-Para

 * Para rubber tree (Pará rubber tree)
 * parable of the broken window (an economics topic with environmental relevance)
 * paradise
 * paradise garden
 * Paradise River Hydroelectric Generating Station
 * paraffin
 * (paraffin lamp) kerosene lamp
 * (paraffin oil) kerosene
 * (parahydrogen: see) orthohydrogen
 * (parallel drainage system: see) drainage system
 * paralytic shellfish poisoning (PSP)
 * parametrization (climate)
 * Paraquat (a herbicide)
 * parasite
 * parasitic worm
 * parasitoid
 * parasitology
 * (parasol: see) umbrella
 * parazoa

Parb-Pars

 * parchment
 * parclo interchange (partial cloverleaf interchange)
 * park (see also list of national parks)
 * park and ride
 * parking
 * (parking garage: see) multi-storey car park
 * parking lot
 * parking space
 * Parks Canada
 * parkway
 * parrot (see under Threats and conservation)
 * (Parsons turbine: see) steam turbine

Part-Parz

 * (partial lunar eclipse: see) lunar eclipse
 * partial zero-emissions vehicle (PZEV)
 * (partially hydrogenated soybean oil: see) trans fat
 * (partially hydrogenated vegetable oil: see) trans fat
 * particle (ecology)
 * particle board
 * particle detector
 * particle physics
 * particle radiation
 * particulates (particulate matter) (PM)
 * parts per million

Pas

 * passenger car (passenger carriage) (of a train)
 * (passenger conveyor: see) escalator
 * (passenger jet: see) jet airliner
 * passenger pigeon (extinct bird)
 * passenger ship (passenger liner)
 * (passenger train: see) train
 * passenger train human waste disposal
 * passerine (bird of the order Passeriformes)
 * passive component (see same for "passive filter")
 * Passive infrared sensors (PIRs)
 * passive radar
 * passive radiator
 * passive safety feature
 * (passive smoking: see) tobacco smoking
 * passive solar (heating)
 * (passive sonar: see) sonar
 * passively safe
 * pasteurization

Pat-Paz

 * pathogen
 * (pavement: 2 meanings selected from the disambiguation page)
 * pavement (roads)
 * (pavement [British English]) sidewalk

Pe-Pea

 * (pea and bean weevil: see) bean weevil (seed beetle)
 * peace park
 * peaceful coexistence
 * peak food
 * peak grain
 * peak ground acceleration (for measuring earthquakes)
 * (peak hour) rush hour
 * (peak land value intersection) PLVI
 * peak mayhem
 * (peak oil: see) Hubbert peak
 * (Peak XV) Mount Everest
 * peak water
 * pearl
 * peasant foods
 * peat
 * (peat bog: see) bog

Peb-Pek

 * pebble bed reactor
 * (pedal bicycle) bicycle (pedal cycle)
 * pedestrian
 * pedestrian crossing (crosswalk)
 * (pedestrian overpass: see) overpass
 * (pedestrian scramble) Barnes Dance
 * pedestrian street (pedestrian mall)
 * (pedestrian underpass: see) tunnel
 * (pedestrian zone) auto-free zone (car-free zone) (pedestrianized zone)
 * pedestrian-friendly
 * (pedicab) cycle rickshaw (velotaxi) (trishaw)
 * pedology (soil study)

Pel-Peq

 * pelagic zone
 * Pelee, Ontario
 * pelican crossing (from pelicon crossing: pedestrian light-controlled crossing, a synonymous term)
 * Pelican Island National Wildlife Refuge
 * Pemex (Petróleos Mexicanos) (Mexico's state-owned, nationalized petroleum company)
 * pencil lead (not lead)
 * peninsula
 * penstock
 * (penumbral eclipse: see) lunar eclipse
 * people mover
 * (people food: see) food
 * People for the Ethical Treatment of Animals
 * (peoplecarrier: see) minivan
 * pepper spray

Per

 * Percy Schmeiser (farmer)
 * periodic table (periodic table of the chemical elements) (Mendeleev periodic table)
 * permaculture
 * permanent crop
 * permanent water rights (Alberta)
 * permeability (fluid)
 * permeable paving
 * (permissive waste: see) waste (law)
 * perpetual motion
 * Perseids (Perseid meteor shower)
 * Persian Trident Bat (triple nose-leaf bat) (threatened)
 * (Persian wheel) water wheel (waterwheel) (Norse mill) (noria)
 * Persistent Organic Pollutant (POP)
 * personal rapid transit (PRT)
 * personal water craft
 * perverse effects of vaccination

Pes

 * pesco/pollo vegetarianism (pescetarianism) (semi-vegetarianism)
 * pest (animal)
 * pest control
 * pest control of slugs
 * pest zapper
 * pesticide
 * pesticide misuse
 * pesticide poisoning
 * pesticide side effects
 * pesticide toxicity to bees
 * pestilence

Pet-Petq

 * pet
 * (pet burial: see) burial
 * (pet cat: see) cat (see under Environmental effects)
 * (pet cemetery: see) cemetery (see under Cemeteries for pets)
 * pet cloning (see under "Controversy")
 * (pet fish: see) aquarium (see especially under Ecology) (see also list of aquaria)
 * (pet raccoon: see) raccoon (see under "Raccoons as pets")
 * pet skunk (see under Rabies)
 * pet store (pet shop)

Petr-Petrn

 * Petri dish
 * petrifaction (petrification)
 * Petrified Forest National Park
 * petrified wood
 * petrifying well

Petro (in compound words)

 * Petro-Canada

Petroa-Petrok

 * Petrobras 36 Oil Platform
 * petrochemical
 * petrochemicals
 * petrochemistry
 * PetroChina (PetroChina Company Limited)
 * petrocide
 * petrocurrency
 * (petrodiesel: see) diesel
 * petrodollar
 * petrodollar recycling
 * petroform
 * petroglyph (an image recorded on stone)
 * Petroglyphs Provincial Park
 * petrography

Petrol

 * (petrol) gasoline (motor spirit)
 * (petrol barrel: see) barrel (unit)
 * (petrol bomb) Molotov cocktail
 * (petrol engine) gasoline engine
 * (petrol oil) petroleum (crude oil)
 * (petrol pump: see) filling station (gas station) (petrol station)
 * (petrol station) filling station
 * (petrol tax) fuel tax (gasoline tax) (gas tax) (fuel duty)
 * (petrolatum) petroleum jelly (brand name "Vaseline")
 * Petróleos de Venezuela (Petróleos de Venezuela, S.A.) (PDVSA) (Venezuelan state-owned petroleum company)
 * (Petróleos Mexicanos) Pemex (Mexico's state-owned, nationalized petroleum company)
 * petroleum (crude oil)
 * petroleum coke
 * (petroleum crisis: see) energy crisis
 * (petroleum disaster) oil spill
 * petroleum engineering
 * (petroleum ether) benzine
 * petroleum geochemistry
 * petroleum geology
 * (petroleum industry: see) history of the petroleum industry in North America
 * petroleum jelly (petrolatum) (brand name "Vaseline")
 * petroleum maturation
 * petroleum politics
 * petroleum product
 * (petroleum refinery) oil refinery
 * petroleum revenue tax (PRT) (in the United Kingdom)
 * (petroleum war: see) oil imperialism theories
 * petrolhead (a type of person)
 * Petrolia, Ontario ("Canada's Victorian Oil Town")
 * petrology

Petrom-Petrzz

 * Petronas (Petroliam Nasional Berhad) (Malaysia's state-owned oil and gas company)
 * Petronius Platform (oil rig)

Pets-Petz

 * (pets and work animals as a food source: see) taboo food and drink
 * Petten nuclear reactor (in Petten, the Netherlands)
 * petting zoo

Ph-Pha

 * (pharmaceutical chemistry) medicinal chemistry
 * pharmaceutical company (see also Pharmaceutical industry in China
 * and list of pharmaceutical manufacturers in the United Kingdom)


 * (pharmaceutical industry: see) list of pharmaceutical companies
 * (pharmaceutical product: see) medication
 * pharmaceutics
 * pharmacodynamics
 * pharmacogenetics
 * pharmacogenomics
 * pharmacokinetics
 * pharmacology
 * pharmacophore
 * pharmacopoeia (pharmacopeia)
 * pharmacovigilance
 * pharmacy
 * pharming (genetics)
 * (phases of water cycle: see) water cycle

Phb-Phn

 * Philippine Eagle ("slowly dwindling in numbers")
 * Phillips Disaster (in 1989) (in Texas in the US)

Pho

 * phosphorus (see under Precautions)
 * photobiology
 * photochemical reaction
 * photochemistry
 * photohydrogen
 * (photopollution) light pollution (luminous pollution)
 * photosynthesis
 * photosynthetic pigment
 * photosynthetically active radiation (PAR)
 * photosystem (photosynthetic reaction center)
 * (phototherapy) light therapy
 * phototoxic
 * photovoltaic power stations
 * photovoltaics (PV) (see under Environmental impacts)
 * photovore

Phy-Phys

 * physical chemistry
 * physical geography
 * physical oceanography
 * physical science
 * physics (see also list of physics topics)
 * (Physiographic Regions of the United States: see) United States physiographic region
 * (physiological dead space: see) dead space
 * physiological plant disorders
 * physiology

Phyt-Phyz

 * phytochemical (phytonutrient) (see also list of phytochemicals and foods in which they are prominent)
 * phytochemistry
 * phytochrome
 * phytoestrogen
 * phytohaemagglutinin (PHA) (phytohemagglutinin)
 * (phytohormone) plant hormone (plant growth regulator) (PGR)
 * (phytology) botany (plant science[s]) (plant biology)
 * phytonomy
 * (phytonutrient) phytochemical
 * phytopathology
 * (phytophagia: see) phagy
 * (phytophagy: see) phagy
 * phytoremediation (treatment of environmental problems by means of plants)
 * (phytotherapy) herbalism
 * phytotreatment

Pi

 * picotechnology
 * piezoelectric microbalance
 * piezoelectric motor
 * piezoelectricity
 * pigment
 * Pigovian tax (see under Pollution taxes)
 * pile
 * pile dwellings
 * pile-up (traffic accident involving many vehicles)
 * piledriver
 * Pilot project on Delivery of water to households far from sources of safe water
 * pinworm (a parasitic roundworm)
 * pioneer plant
 * pioneer species
 * pipeline inspection gauge (PIG)
 * pipeline transport
 * Piper Alpha (a former North Sea oil production platform) (involved in an explosion and a fire)
 * piston
 * (piston engine) reciprocating engine

Pl-Plam

 * placer deposit
 * placer mining
 * (plague: see) pandemic
 * plague pit
 * plain

Plan-Plans

 * (planet Earth) Earth
 * planetarium
 * (Planétarium de Montréal) Montreal Planetarium
 * planetary boundary layer (PBL)
 * planetary ecosynthesis
 * planetary engineering
 * planetary protection
 * planetary science (planetology) (planetary astronomy)
 * planktology
 * plankton
 * (planned city: see) new town (planned community) (see also list of planned cities)
 * planned obsolescence
 * planned ruins

Plant (separate word)

 * plant
 * (plant biology) botany
 * (plant biotechnology: see) plant breeding
 * plant breeders' rights (plant variety rights) (PVR)
 * plant breeding
 * (plant community: see) biocoenosis (biocoenose) (biocenose) (biotic community) (ecological community)
 * (see also list of plant communities in the British National Vegetation Classification)


 * (plant disease: see) phytopathology (plant pathology)
 * plant embryogenesis
 * (plant fiber: see) fiber crop
 * (plant growth substance) plant hormone (plant growth regulator) (PGR)
 * (plant hardiness zone: see) USDA plant hardiness zone
 * plant hormone (plant growth regulator) (PGR)
 * (plant improvement: see) plant breeding
 * (plant invasion: see) invasive species
 * (plant nursery: see) nursery (horticulture)
 * plant nutrition
 * (plant pathology) phytopathology
 * plant physiology
 * plant propagation
 * (plant science) botany
 * plant senescence
 * plant sexuality
 * (plant succession: see) ecological succession
 * plant tissue culture
 * (plant variety rights) (PVR) plant breeders' rights
 * plant virus

Plant (in hyphenated compound words)

 * plant-based diet
 * plant-made pharmaceuticals (PMPs) (biopharming)

Planta-Plantz

 * plantation
 * plantation economy
 * plantation era
 * (planting) sowing

Plas

 * plastic (see under The environment, especially under Biodegradable Plastics)
 * (plastic bag: see) plastic shopping bag
 * plastic bullet (plastic baton round)
 * (plastic electronics) organic electronics
 * plastic explosive (plastique)
 * plastic goods
 * plastic limit (soils) (for water content)
 * plastic mulch
 * plastic recycling
 * (Plastic Recycling Code: see) resin identification code
 * plastic shopping bag
 * plastic wrap (cling-film)
 * plastics engineering

Plat-Plaz

 * plate tectonics (see also list of plate tectonics topics)
 * plateau

Plb-Plt

 * plough (plow)
 * plowshare (ploughshare) (plough share)

Plu-Plz

 * plug (horticulture)
 * plumbing
 * plumbing drainage venting
 * plumbing fixture
 * (Plus 15) +15 (in Calgary in Canada) ("the world's most extensive pedestrian skywalk system")
 * plutonium
 * (plutonium economy) fast breeder (fast breeder reactor) (FBR)
 * pluvial lake

Pm-Pn

 * (pneumatic drill) jackhammer (pneumatic hammer)
 * pneumatic filter
 * (pneumatic tire) tire (tyre) (pneumatic tyre)
 * pneumatic tool
 * pneumatic tube (pneumatic mail) (pneumatic post)
 * pneumatics
 * pneumoconiosis
 * pneumonoultramicroscopicsilicovolcanoconiosis

Po-Pok

 * poaching
 * point of no return (a topic in social psychology, with environmental relevance)
 * poison
 * poison control center (PCC)
 * poison dart frog (poison arrow frog)
 * (poison gas: see) chemical warfare
 * (poison hemlock: see) Conium
 * (poison oak: see) Toxicodendron
 * Poison Sumac (Toxicodendron vernix or Rhus vernix)
 * poison-ivy (plant)
 * (poisoning, carbon monoxide: see) carbon monoxide poisoning
 * (poisonous fungus: see) mushroom poisoning
 * (poisonous mushroom: see) mushroom poisoning
 * poisonous snake

Pol-Pola

 * (polar aurora) aurora (astronomy)
 * (polar cap) polar ice cap
 * polar circle
 * polar climate
 * (polar day: see) midnight sun
 * polar easterlies
 * polar high
 * polar ice cap
 * (polar light: see) aurora (astronomy)
 * polar low
 * (polar mesospheric cloud) noctilucent cloud
 * polar mesospheric summer echoes (PMSE)
 * polar night
 * polar region
 * (polar reversal) magnetic polarity reversal
 * polar stratospheric cloud (PSC) (nacreous cloud)
 * polarization

Polb-Polk

 * pole of inaccessibility
 * pole shift theory
 * polio vaccine
 * poliomyelitis (infantile paralysis) (see same for "poliovirus" [PV])
 * (political ecologist: see) Green movement
 * political ecology

Poll

 * pollarding (in woodland management)
 * pollen
 * pollen basket (of honeybee)
 * pollen core
 * pollen count (concentration in air)
 * pollen source
 * pollen tube (of plant)
 * pollen zone
 * pollenizer (polleniser) (plant that provides pollen)
 * pollination
 * pollination management
 * pollinator (agent that moves pollen)
 * pollinator decline
 * pollutant
 * Polluter Pays
 * polluter pays principle
 * (polluting emission: see) emission
 * pollution
 * (pollution credit: see) emissions trading
 * (pollution pump: see) exhaust gas recirculation (EGR)

Polm-Polz

 * polychlorinated biphenyl (PCB)
 * polyculture
 * polycyclic aromatic hydrocarbon (PAH)
 * polyester
 * (polyester recycling: see) Recycling of PET Bottles
 * polymer
 * polymer chemistry (macromolecular chemistry)
 * polymer clay
 * polymer degradation
 * polymer physics
 * polymer solar cells
 * polymerase
 * polymerase chain reaction (PCR)
 * polymeric membranes
 * polymerization
 * polymorphism (biology)
 * (polyphagy: see) phagy
 * polystyrene (see under Dangers and Fire hazard)
 * (polytetrafluoroethylene) (PTFE) teflon (see especially under "Toxicity")
 * polyvinyl chloride (PVC)
 * polywater

Pop

 * POP Air Pollution Protocol (Protocol to the 1979 Convention on Long-Range Transboundary Air Pollution on Persistent Organic Pollutants)
 * (pop can) aluminum can (aluminium can)
 * population (see also)
 * list of countries by population
 * list of countries by population (graphical)
 * list of the most densely populated administrative units in the world
 * List of the most populous country subdivisions
 * population biology
 * population bottleneck (genetic bottleneck)
 * (population cartogram: see) cartogram
 * (population census: see) census
 * population control
 * (population count: see) census
 * population decline
 * population density
 * population dynamics
 * population ecology
 * (population exchange: see) population transfer
 * (population explosion: see) overpopulation
 * population genetics
 * population geography
 * population growth (see also list of most populous nations by 2025)
 * population growth rate
 * population history of American indigenous peoples (see under Depopulation from disease)
 * population of Atlanta
 * population of Brazil
 * population of England
 * (population of Finland: see) demographics of Finland
 * population of India
 * population of Metropolitan Chicago
 * (population of Paris: see) demographics of Paris
 * population of Texas cities in 2000
 * population of the Byzantine Empire
 * (population of the United States: see) demographics of the United States
 * population process (including environmental and ecological applications)
 * population size
 * population statistics
 * (population time bomb: see) overpopulation
 * population transfer
 * population transfer in the Soviet Union
 * population viability analysis (PVA)

Poq-Por

 * pork tapeworm (infecting pigs and humans)
 * portable stove (see "wild animals" in paragraph 2 and see "hazardous waste" in paragraph 4, both under Advantages and disadvantages)
 * Portland cement

Pos

 * (positive lightning: see) lighting
 * positive pressure
 * positive pressure ventilation
 * positive streamer
 * positron emission tomography (PET)
 * post scarcity
 * post-consumer waste
 * post-exposure prophylaxis (PEP)
 * post-glacial rebound
 * post-harvest handling
 * post-industrial economy
 * post-industrial society

Pot

 * (potability: see) water
 * potability of backcountry water
 * (potable: see) drinking water
 * (potable water: see) drinking water
 * potash
 * potassium hydroxide (caustic potash) (potassa) (potash lye) (potassium hydrate)
 * potato ("the world's most important non-cereal crop")
 * (potato blight: see) Phytophthora infestans
 * (potato bug) Jerusalem cricket (Stenopalmatus) (niño de la tierra) (old bald-headed man)
 * potato famine
 * (potato fungus) Phytophthora infestans
 * potato spindle tuber viroid (PSTV) (see PSTV)
 * (potential chemical warfare agent: see) chemical warfare
 * potential energy
 * potential evaporation
 * potential evapotranspiration (PET)
 * (potential hill: see) potential well
 * potential temperature
 * potentially hazardous asteroid (PHA)
 * pottery
 * potty

Pou-Pov

 * pouched rat (see "monkeypox")
 * poultry
 * poultry disease

Pow

 * powdery mildew
 * power (physics)
 * (power conservation) energy conservation
 * power consumption
 * power control (electric power control)
 * power conversion
 * (power cut) power outage
 * power delivery
 * (power density) specific power (power per unit mass)
 * (power distribution: see) electricity distribution
 * power engineering
 * (power excursion) criticality accident
 * (power failure) power outage
 * (power generation) electricity generation
 * (power grid: see) electric power transmission
 * (power inverter: see) inverter (electrical)
 * power level
 * (power line: see) electric power transmission
 * power management
 * (power meter: see) electricity meter
 * power outage (power cut) (power failure) (see also list of power outages)
 * power station (power plant) (see also list of power stations in England and list of power stations in Scotland
 * and list of power stations in Wales)


 * power strip (power bar) (gangplug) (multibox)
 * power supply in Norway
 * (power surge) voltage spike (power spike)
 * power transfer
 * power transmission
 * (power unit: see) electrical generator
 * power word (see under Environmental Issues)

Pr-Prd

 * PR Watch (see under Articles)
 * Practical Action (formerly, Intermediate Technology Development Group [ITDG]) (based in the UK)
 * prairie

Pre

 * pre-1970 Southern Hemisphere tropical cyclone seasons
 * pre-1980 North Indian Ocean cyclone seasons
 * pre-1980 Southern Hemisphere tropical cyclone seasons
 * (pre-consumer waste: see) recycling
 * precautionary principle
 * precipitation (meteorology)
 * precision agriculture (precision farming)
 * precision seeding
 * predation
 * pregnant leach solution (PLS)
 * prehistoric life
 * preservationist
 * preservative
 * (preserved food) food preservation
 * (President's Council on Bioethics) The President's Council on Bioethics
 * (pressure barrier osmosis: see) osmosis
 * (pressure lamp: see) kerosene lamp
 * (pressure sickness: see) diving hazards and precautions
 * (pressure tank: see) pressure tank
 * pressure vessel
 * (pressure-treated lumber: see) lumber (see under "Preservatives")
 * (pressure-treated wood: see) lumber (see under "Preservatives")
 * pressurized water reactor (PWR)
 * preventive maintenance (PM) (a means of waste management)
 * (preventive measure: see) risk
 * preventive medicine
 * (preventive paradigm: see) precautionary principle

Pri

 * (price of Earth) value of Earth
 * Price-Anderson Nuclear Industries Indemnity Act
 * primary energy
 * primary nutritional groups
 * primary producer
 * primary production (production of biological organic compounds)
 * primary sector of industry (see same for "primary products")
 * primate
 * (primate extinction: see) ape extinction
 * primatology
 * primer (paint)
 * prior appropriation water rights

Pro-Proo

 * probiotic
 * processed cheese
 * (processed food: see) food preservation
 * (processed meat: see) meat
 * processing of coffee
 * (Processing of Cotton: see) cotton
 * Procession of the Species (an annual Earth Day celebration)
 * (producer gas) wood gas (syngas)
 * producer species
 * productivism
 * products based on refined oil
 * Professional Lighting Design (magazine)
 * prohibitory traffic sign
 * projectile
 * (projection [cartography]: see) map projection
 * prokaryote (see under Environment)

Prop-Proz

 * propane
 * (propane refrigeration: see) absorptive refrigeration
 * propellant
 * propeller
 * (propeller wind generator: see) wind turbine
 * Property and Environment Research Center (PERC)
 * proposed future transport
 * propulsion method
 * prospecting
 * protected area (see also list of protected areas in India)
 * protected areas
 * protected areas of California
 * protected areas of Finland
 * protected areas of Michigan
 * protein biosynthesis
 * protein engineering
 * protein synthesis
 * protein toxicity
 * Protocol on Environmental Protection to the Antarctic Treaty
 * proton-exchange fuel cell (Polymer Electrolyte [Membrane] Fuel Cell) ("PEM" or "PEMFC")
 * proton-proton chain reaction
 * protozoa
 * protozoology

Ps-Pt

 * psychedelic mushroom
 * psychedelics, dissociatives and deliriants (see under Hallucinogenic plants, fungi, and animals)

Pu-Pub

 * public awareness of science
 * public health
 * Public Health Cigarette Smoking Act
 * public health law
 * Public Interest Research Groups (PIRGs)
 * Public Land Survey System
 * (public lavatory: see) toilet
 * public light bus
 * (public park: see) park
 * (public restroom: see) toilet
 * Public Safety
 * Public Safety and Emergency Preparedness Canada
 * public transit
 * public transport (public transit)
 * public utility
 * public works

Puc-Pul

 * Puerto Rican dry forests
 * Puerto Rico Trench
 * puffin crossing (pedestrian user-friendly interface)
 * Puget Sound environmental issues
 * (pulp: see) wood pulp
 * pulp and paper industry
 * (pulp mill: see) wood pulp
 * pulper (in agriculture; in the wood-processing industry; in recycling)
 * pulping
 * pulpwood
 * pulse (legume)
 * pulse jet engine
 * pulsed power

Pum-Puz

 * pumice
 * pump boat
 * (pump jack) nodding donkey
 * pumped-storage hydroelectricity
 * (pumper truck: see) fire apparatus
 * pumping for use in water purification systems
 * pumping station
 * (pumping test: see) aquifer test
 * puppy mill
 * Pure Food and Drug Act
 * purification
 * purified water
 * purity
 * push-pull technology
 * putrefaction

Pv-Pz

 * pyramid of numbers
 * pyrocumulus
 * pyroelectricity
 * pyrolysis (see under Pyrolysis and waste management and under Fire protection)
 * pyrometallurgy
 * pyrotechnics