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"due mostly to human activities"
Wow, you have a fourth grade education?
http://www.csmonitor.com/2002/0607/p02s02-usgn.html
"In a report to the United Nations, the Environmental Protection Agency says that man-made greenhouse gases in the US will increase 43 percent between 2000 and 2020. And while acknowledging some scientific uncertainties, the EPA says that the recent warming trend "is real and has been particularly strong within the past 20 years ... due mostly to human activities."