Environment issues

The envelope of gases surrounding the earth or another planet.

The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.

Power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines.

Food or farming methods produced or involving production without the use of chemical fertilizers, pesticides, or other artificial agents.

the fact or process of a species, family, or other group of animals or plants becoming extinct.

convert (waste) into reusable material.

the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.

a biological community of interacting organisms and their physical environment.