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This report from UNEP "Policy Implications of Warming Permafrost" from November 2012 includes the following extraordinary statement about the omission of feedbacks from the Climate-Models use for IPCC 5th Assessement Report: -
"The effect of the permafrost carbon feedback on climate has not been included in the IPCC Assessment
Reports. None of the climate projections in the IPCC Fourth Assessment Report include the permafrost carbon feedback (IPCC 2007).
Participating modeling teams have completed their climate projections in support of the Fifth Assessment Report, but these projections do not include the permafrost carbon feedback. Consequently, the IPCC Fifth Assessment Report, due for release in stages between September 2013 and October 2014, will not include the potential effects of the permafrost carbon feedback on global climate."
Some Comments on IPCC AR5 & the Omissions of Significant Feedback Effects
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