The Copenhagen Diagnosis is a climate change report written by 26 climate scientists from eight countries. It was published in 2009 and was a summary of the peer-reviewed literature to date. A media conference was held to present the major findings of the report at the 2009 United Nations Climate Change Conference, in Copenhagen, Denmark, chaired by the Copenhagen Diagnosis coordinating lead author, Matthew England.
The Copenhagen Diagnosis aimed to synthesize the most policy-relevant climate science published since the close-off of material for the previous Intergovernmental Panel on Climate Change's Working Group 1 Report (AR4), thus serving as an interim evaluation of the evolving science midway through an IPCC cycle, with IPCC AR5 not due for completion until 2013.
The report also aimed to serve as a handbook of science updates that supplements the IPCC AR4 in time for the 2009 United Nations Climate Change Conference held in December 2009, and for any national or international climate change policy negotiations that followed.
The Copenhagen Diagnosis reached a number of conclusions, as set out in the executive summary, including:
To maximize global outreach, the major findings of the Copenhagen Diagnosis were translated into 12 languages.
The Copenhagen Diagnosis has been accessed online over a million times since its release, and was named an Outstanding Academic Title by the American Library Association's Choice publication in 2012. 
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