Global warming occurs when greenhouse gases and fumes are put out into the earths atmosphere. Data has shown a higher release of carbon dioxide into the world as the years continue. Until the 1920's coal was the most popular fume to use. By 1968 liquid fuels became popular. Cement production and gas flaring also caused global warming. " Global Warming" by David E. Newton is a great source for information. It is filled with tables of data and shows you how the earths atmosphere has been greatly affected and changed by global warming. A study has also been shown that the increase in temperature in the earth has gone up when more carbon dioxide is used. As the earths internal and external temperature rises the more global warming is coming to an effect.
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