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National Academies of Science
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American Association for the Advancement of Science as the world's largest general
scientific society 2006: The scientific evidence is clear: global climate change caused by human activities is occurring now, and it is a growing threat to society.... The pace of change and the evidence of harm have increased markedly over the last five years. The time to control greenhouse gas emissions is now.
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US National Academy of Sciences: "In the judgment of most climate scientists, Earth's warming in recent decades has been caused primarily by human activities that have increased the amount of greenhouse gases in the atmosphere.."[117]
97-98% of the most published climate researchers think humans are causing global warming. Another study found just under 90% of earth scientists, broadly construed, think significant man made global warming is occurring. Of those who didnt, most were unsure. [107]
http://en.wikipedia.org/wiki/Scientific opinion on climate change#Scientific consensus
