Much Ado About CO2

Science Matters

Following a presentation in London by Dr. Murry Salby, there has been much discussion at several sites: No Tricks Zone, Climate Etc. and WUWT. These threads are always a challenge for a reader because there are exchanges debating various issues between highly convinced people who are seldom explicit about the assumptions underlying their relative positions.

Interesting in this case are the reactions to Salby’s assertion that the observed rise in atmospheric CO2 is caused by effects of rising temperatures upon natural sources/sinks, and not by rising fossil fuel emissions. (Leaving aside for today the whole other issue of climate sensitivity to changes in CO2).

Attacks have been mounted both by supporters of IPCC, and also by skeptics of IPCC alarms who nevertheless accept the notion that all or most of the measured rise in CO2 is from humans, fossil fuels and cement in particular. Still others find flaws in Salby’s…

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