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news article:  http://www.cnn.com/2008/TECH/science/11/21/climate.danger.zone/index.html

original report: http://snre.ufl.edu/common/humphrey/literature/Hansen2008TargetCO2.pdf

Here are two reports verifying tipping points such as Hansen addresses:
http://snre.ufl.edu/common/humphrey/literature/Schuur2008PermafrostCarbon.pdf
http://snre.ufl.edu/common/humphrey/literature/Shakhova2008AbruptMethaneRelease.pdf

Dr. Stephen R. Humphrey, Director of Academic Programs,
School of Natural Resources and Environment,
Box 116455, 103 Black Hall, University of Florida
Gainesville, FL  32611-6455  USA
Tel. 352-392-9230, Fax 352-392-9748
http://snre.ufl.edu<http://snre.ufl.edu/>