environment - the air, water and land in which people, animals and plants live, overpopulation - the increasing population of the world, deforestation - the cutting down of trees in an area, global warming - a gradual increase in the earth’s temperature caused by gases surrounding the earth, acid rain - rain which is polluted by chemicals, emission - an amount of gas or other substance that a machine or factory produces and sends into the air, extinct - no longer existing, endangered species - a type of plant or animal that might stop existing, pollute - to make air, water or soil dirty, resource depletion - lack of natural resources worldwide,

Environmental issues

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