A leaked draft of the UN’s most comprehensive study ever on climate change shows increasing evidence that links human activity to global warming.

It is "extremely likely" mankind is responsible for more than half of the observed temperature rises since the 1950s, a United Nations agency said in a draft report. In the UN’s last study, in 2007, human influence on the temperature rise was deemed "very likely."

The document was posted by the blogger Alec Rawls on the website In that post, Rawls, who is also an official reviewer of the study, said he regards his confidentiality agreement with the UN agency responsible for the research as "vitiated by the systematic dishonesty of the report."

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