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| Description: Humans have been modifying the environment over extensive areas for thousands of years Fire Overgrazing of marginal lands Water vapor and carbon dioxide absorb heat and are largely responsible for the greenhouse effect of the atmosphere Burning fossil fuels has added great quantities of carbon dioxide to the atmosphere Picture Stats: Views: 336 Filesize: 470.06kB Height: 794 Width: 1411 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39737 |