DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Air pollution. A trembling Sun silhouetted against the dark smoke coming out of an industrial chimney. The main forms of air pollution derive from the burning of fossil fuels such as coal, crude oil and natural gas in power stations, automobiles and for domestic purposes. A huge amount of harmful gases is thrown into the atmosphere following burning, including sulphur dioxide and nitrogen oxides which are involved in the formation of acid rain and carbon dioxide which plays an important role in the global warming effect.
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