The 2013 Intergovernmental Panel on Climate Change Fifth Assessment Report noted that it is "extremely likely" that climate change is being driven by humans:
It is extremely likely [defined as 95-100 percent certainty] that more than half of the observed increase in global average surface temperature from 1951 to 2010 was caused by the anthropogenic [human-caused] increase in greenhouse gas concentrations and other anthropogenic forcings together. [IPCC]
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