Journal
SCIENTIFIC AMERICAN
Volume 292, Issue 3, Pages 46-53Publisher
SCI AMERICAN INC
DOI: 10.1038/scientificamerican0305-46
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The conventional assumption that anthropogenic greenhouse gases have altered the earth's climate only within the past 200 years has been challenged. New evidence suggests that early humans began contributing significant quantities of greenhouse gases to the atmosphere thousands of years earlier, through deforestation and irrigation to grow crops. As a result, human beings kept the planetnotably warmer than it would have been otherwise.
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