acid deposition

acid mine drainage

acid rain

acidic

active solar energy collection

acute exposure

adaptation (climate change)

adaptation (evolution)

adaptive management

aerosols

age structure

agricultural revolution

agriculture

air pollutant

air pollution

airshed

allergen

alloy

anthropocentrism

aquaculture

aquifer

artificial selection

asbestos

asbestosis

asthenosphere

atmosphere

atmospheric deposition

atmospheric pressure

atom

autotroph (primary producer)

bacillus thuringiensis (Bt)

background extinction rate

basic

bedrock

benthic

bioaccumulation

biocapacity

biocentrism

biodiesel

biodiversity

biodiversity hotspot

bioenergy

biofuel

biological control

biological hazard

biomagnification

biomass

biome

biophilia

biopower

bioprospecting

biosphere

biosphere reserves

biotechnology

birth control

boreal forest

bottle bill

bottleneck

breakdown product

brownfield

campus sustainability

canopy

cap-and-trade

captive breeding

carbohydrate

carbon

carbon capture and storage

carbon cycle

carbon dioxide

carbon footprint

carbon monoxide

carbon offset

carbon pricing

carbon tax

carbon trading

carbon-neutrality

carcinogen

carrying capacity

case history

Cassandra