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Posted Mon May 10 2010: from PNAS:
Importance of carbon dioxide physiological forcing to future climate change
An increase in atmospheric carbon dioxide (CO2) concentration influences climate both directly through its radiative effect (i.e., trapping longwave radiation) and indirectly through its physiological effect (i.e., reducing transpiration of land plants).... [R]elative humidity remains roughly constant in response to CO2-radiative forcing, whereas relative humidity over land decreases in response to CO2-physiological forcing as a result of reduced plant transpiration. Our study points to an emerging consensus that the physiological effects of increasing atmospheric CO2 on land plants will increase global warming beyond that caused by the radiative effects of CO2.
[Read more stories about: feedback loop, death spiral, carbon emissions, holyshit]

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'Doc Michael says:
OMG! Even the plants are conspiring against us!

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