Carbon dioxide and methane (as well as other gases) in the atmosphere trap heat from the sun close to the Earth's surface, warming the atmosphere. Combustion of fossil fuels is the largest anthropogenic, or man-made, source of carbon dioxide. From 1860 to 1994, carbon dioxide in the atmosphere rose from 280 to more than 350 parts per million. A network of scientists organized by the United Nations predicts that by 2100, if emissions are not reduc ...
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29 Jan 2016