A

Agroecology- the application of ecological principles to agricultural systems and practices, or the branch of science concerned with this.

Acid rain-rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes.

Air pollution- the presence in or introduction into the air of a substance which has harmful or poisonous effects.

Anti-globalization- opposition to the increase in the global power and influence of businesses, especially multinational corporations.

B

Bacterium-a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease.

Bacteriology-the study of bacteria.

Backwather-a part of a river not reached by the current, where the water is stagnant "the eels inhabit backwaters" an isolated or peaceful place.

Balance of nature-the stable state in which natural communities of animals and plants exist, maintained by adaptation, competition, and other interactions between members of the communities and their nonliving environment.

Bankfull stage-the water level, or stage, at which a stream, river or lake is at the top of its banks and any further rise would result in water moving into the flood plain.

C

D

F

L