Over at Watts Up With That?, Willis Eschenbach has written an interesting post entitled Some people claim, that there’s a human to blame …, regarding whether humans are responsible for the sharp rise in CO2 levels after 1850. He is upfront about his own personal view:
Let me preface this by saying that I do think that the recent increase in CO2 levels is due to human activities.
The strongest evidence for this view comes from the historical record, as it reveals an “excellent agreement between the eight different ice cores, including the different methods and different analysts for two of the cores.” Not only that, but there is also “excellent agreement between the ice cores and the Mauna Loa data,” which suggests that it “represents a good estimate of the historical background CO2 record,” although the possibility that the agreement is due to coincidence, conspiracy or simple error cannot be totally excluded. Willis Eschenbach then argues:
So if you are going to believe that this is not a result of human activities, it would help to answer the question of what else might have that effect. It is not necessary to provide an alternative hypothesis if you disbelieve that humans are the cause … but it would help your case.
A very sensible point. But what caught my eye was a comment by a reader who calls himself “Darkinbad the Brightdayler” (June 7, 2010 at 1:05 a.m.; the third response from the top), who objected to the word “believe” in the paragraph just cited:
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