Dear John,
there is no blunder here. This is an idealized scenario. If CO2
emissions go to zero abruptly (red curve), then the committed warming
(ie the warming in the pipeline because the ocean hasn't equilibrated
yet) is approximately compensated by the decrease in CO2 emissions
induced by zero emissions (because natural sinks to vegetation and ocean
keep working).
Regards,
Olivier
*Blunder 2*. IPCC has ignored the warming effect of accumulated CO2.
They say that global temperature rise will be halted when net CO2
emissions have fallen to zero, ignoring the effect of accumulated CO2
and other forcing agents in the atmosphere.
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Our opinion piece is now published in PNAS
<http://www.pnas.org/content/113/27/7287>
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