The scientists agreed to focus on providing more information about the actual impacts of global warming and what can be done to reduce GHG emissions growth. In order to get the report out by 2013, within the usual 6-year time frame, they decided to omit several sections -- primarily the more data-heavy scenarios some researchers use to build their global warming models.
For those who've criticized the IPCC for being too conservative or for employing outdated numbers, the panel sponsored a series of workshops to elaborate more timely emissions scenarios -- taking into account new statistics on energy use, population growth and emissions reductions technologies. Its members chose four to use in future models, the most pessimistic of which predicts atmospheric carbon dioxide levels could hit 1370 ppm by 2100; the most optimistic one predicts they will peak at 490 ppm before starting to fall.
http://www.treehugger.com/files/2008/04/next-ipcc-report.php
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