The Copenhagen Diagnosis

Authors of the landmark 2009 climate report "The Copenhagen Diagnosis" estimate that by 2020 industrial nations must reduce their greenhouse gas emissions by around 40% below 1990 levels to secure a decent chance of avoiding dangerous human interference with the climate system. The Copenhagen Diagnosis authors used IPCC Fourth Assessment Report (AR4) projections as well as post-AR4 analysis to estimate that emissions reductions of around 40% from industrial nations are needed to make it likely to keep global warming below 2°C. In their report released 25 November of this year, the authors noted that many nations had publicly recognized the importance of this 2°C limit. Yet the authors said today that this 2°C warming threshold could be crossed as early as 2040 unless... http://www.copenhagendiagnosis.org