 The Copenhagen Diagnosis is a follow-up of the previous Intergovernmental Panel on Climate Change's Working Group 1 Report.The studies summarized, which date back to the cutoff point of the Working Group 1 Report, are those that authors viewed most relevant to the discussions at the 2009 United Nations Climate Change Conference.The Copenhagen Diagnosis served as the midpoint between IPCC –AR4 and IPCC-AR5.