Pollution

Pollution is an increase of incidence in the environment of substances considered undesireable, when brought about through the activity of mankind. A similar increase, when it occurs through causes not influenced by mankind, isn't considered to be pollution.

There are a number of different types of pollution including air pollution, water pollution[?], light pollution and noise pollution.

Although carbon dioxide isn't toxic -- and actually stimulates plant growth -- environmentalists labeled carbon dioxide a "pollutant" in the 1990s, because they believe that carbon dioxide emissions will lead to harmful global warming (see greenhouse gas, global warming hypothesis).

		Pollution
		Pollution is an increase of incidence in the environment of substances considered undesireable, when brought about through the activity of mankind. A similar increase, when it occurs through causes not influenced by mankind, isn't considered to be pollution. There are a number of different types of pollution including air pollution, water pollution[?], light pollution and noise pollution. Although carbon dioxide isn't toxic -- and actually stimulates plant growth -- environmentalists labeled carbon dioxide a "pollutant" in the 1990s, because they believe that carbon dioxide emissions will lead to harmful global warming (see greenhouse gas, global warming hypothesis). See also: petroleum, renewable energy.
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