If you only follow the IPCC reports casually, you probably wonder "What? Again?" every time you hear about one which you have a lot this year.
To review: there are 3 working groups -- basic science, impacts and mitigation -- and they each release a Summary for Policy makers (SPM) and a full report. This blog started around the time the SPM was released for the science working group (Working Group I)
All those pieces need to be summarized and the SPM for the "Synthesis Report" is due out tomorrow. Expect to see lots of stories about diplomats and scientists negotiating the text (which they do only for the SPMs). This will complete the Fourth Assessment Report (AR4) of the IPCC.