The last time the IPCC released one of these reports was eight years ago, in 2013. That was the Fifth Assessment Report.
That report found that, with 95% certainty, humans have been the dominant cause of global warming since the 1950s.
It looked at the combined average land and ocean surface data between 1880 and 2012, and found the temperature had risen by 0.85C.
It also said the period from 1983 to 2012 in the Northern Hemisphere appeared to be the warmest 30-year period of the last 1,400 years.
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