overpopulation - when there are too many people for the amount of food, facilities and space available in an area. , endangered animals - animals which may soon cease to exist because of the destruction of their habitat and of men's hunting and fishing activities., greenhouse gases - gases, especially carbon dioxide, which are thought to be the cause of a gradual warming of the Earh. , rubbish dumping - the action of getting rid of rubbish., atomic waste dumping - the action of getting rid of radioactive matter left over from the process of nuclear industry. , destruction of natural habitats - destruction of the natural environment in which an animal or plant usually lives. , air pollution/sea pollution - damage caused to the air or sea water by harmful substances we use in our industries. , acid rain - rain which contains harmful chemicals as a result of burning substances such as coal and oil., deforestation - the cutting down of trees over a large area., poaching - catching and killing animals without permission,

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