"The purpose of this report is to synthesize the most policy-relevant climate
science published since the close-off of material for the last IPCC report. The
rationale is two-fold.
First, this report serves as an interim evaluation of the evolving science
midway through an IPCC cycle - IPCC AR5 is not due for completion until 2013.
Second, and most important, the report serves as a handbook of science updates
that supplements the IPCC AR4 in time for Copenhagen in December 2009, and any
national or international climate change policy negotiations that follow."
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