Guest Post by Willis Eschenbach
There’s an interesting measure of atmospheric CO2, called the “airborne fraction”. The airborne fraction is the fraction of the CO2 emitted each year which remains in the atmosphere. When humans emit say 9 gigatonnes of carbon, only about half of that remains in the air. The other half of the emitted carbon is absorbed, “sequestered” in some semi-permanent fashion, by various carbon sinks in the land and the ocean.
Dr. James Hansen of NASA, another in the long line of climate alarmists who don’t mind shafting the poor with expensive energy, has come out with a most surprising statement in his latest paper, Climate forcing growth rates: doubling down on our Faustian bargain, hereinafter Hansen 2012. The statement involves Hansen et al.’s explanation for a claimed recent decrease in the airborne fraction. Here’s their graphic showing the changes in the airborne fraction since 1960.
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