CO2 the control knob

A good explanation:

“For the doubled CO2 and the 2% solar irradiance forcings, for which the direct no-feedback responses of the global surface temperature are 1.2° and 1.3°C, respectively, the ~4°C surface warming implies respective feedback factors of
3.3 and 3.0 (5).” – Andrew A. Lacis, Gavin A. Schmidt, David Rind, Reto A. Ruedy

15 OCTOBER 2010 VOL 330 SCIENCE

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&ved=0CE8QFjAF&url=http%3A%2F%2Fwww.atm.damtp.cam.ac.uk%2Fmcintyre%2Fco2-main-ct-knob-lacis-sci10.pdf&ei=bZHCVOP7H4yeNtCJgKgD&usg=AFQjCNEOPbG-8r2ggtQ_Kig7jiSApAdItw&sig2=Tv4UZHdcSO3TWVjG-fk_TA&cad=rja

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