I’ve previously had very civil conversations with our humble devil and consider him a very entertaining chap indeed. But I’m sure he’ll understand that fuckwit is a term which on occasion must be used.
From Devil’s Kitchen:
In the meantime, as we labour under the terrible heat of the midday sun [Is this right?—Ed.], here’s news of a paper showing that the proportion of CO2 in the atmosphere has not risen over the last 150 years.
To assess whether the airborne fraction is indeed increasing, Wolfgang Knorr of the Department of Earth Sciences at the University of Bristol reanalyzed available atmospheric carbon dioxide and emissions data since 1850 and considers the uncertainties in the data.
In contradiction to some recent studies, he finds that the airborne fraction of carbon dioxide has not increased either during the past 150 years or during the most recent five decades.
Which would rather scupper the proposition that rising temperatures are caused by the rising proportion of CO2 in the atmosphere over the last 150 years.
Pretty damning some might think. Unfortunately, this “interpretation” is utterly incorrect.
I spotted this paper a little while ago and had this ready for whichever climate sceptic fell into this hole.
The paper refers to the “airborne fraction,” now on first blush this may appear to refer to the fraction of carbon in the air. This “interpretation” is false.
The airborne fraction refers to the amount of carbon emitted by humans which is absorbed rather than being retained in the atmosphere.
There had been some theorising that this fraction may have been changed by humanity’s actions, for example deforestation. What Knorr has shown is that the airborne fraction is remarkably stable. What Knorr emphatically does not mean is that the absolute or relative amount of carbon in the atmosphere has been unchanged over the last 150 years.
There is overwhelming evidence that the global atmospheric concentration of CO2 increased from a pre-industrial value of about 280ppm to 379ppm in 2005 (pdf) and the trajectory of these concentration is upwards.
So there we have it – our Monday Climate Fuckwit.