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]
Investigating the large rise in temperatures in recent years — July 2014 was the 353rd consecutive month in which global land and ocean average surface temperature exceeded the 20th-century monthly average — the authors of the paper used a statistical model to deduce that there is "less than one chance in 100,000 that global average temperature over the past 60 years would have been as high without human-caused greenhouse gas emissions" warming the climate.
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