Musings of the Technical Bard

Ronald Bailey has a very good editorial on the subject.  A couple of key portions on the climate change science:

In an email to University of Alabama climatologist John Christy I asked, “Is there a possibility that the teams that compile temperature data could all be making the same set of errors which would result in them finding similar (and perhaps) spurious trends?” Christy replied that he believed this was possible and cited some recent work he had done on temperature trends in East Africa as evidence. In that article he found that using both the maximum and minimum temperature rather than the mean temperature (TMean) used by the three official data sets gives a better indication of actual temperature trends in the region.

Christy found that the maximum temperature (TMax) trend has been essentially zero since 1900 while the minimum temperature (TMin) trend has been increasing. In his email to me, Christy explained, “As it turns out, TMin warms significantly due to factors other than the greenhouse effect, so TMean, because it is affected by TMin, is a poor proxy for understanding the greenhouse effect of ‘global warming’.” Or as his journal article puts it, “There appears to be little change in East Africa’s TMax, and if TMax is a suitable proxy for climate changes affecting the deep atmosphere, there has been little impact in the past half-century.” So if Christy’s analysis is correct, much of the global warming in East Africa reported by the three official data sets is exaggerated. Christy has found similar effects on temperature trend reporting for other regions of the world.

And on the subject of scientific knowledge and credibility:

One thing more transparency won’t fix: the complications and uncertainty inherent in the policy debate about global warming. “In the end, I would hypothesize that the result of the freeing of data and code will necessarily lead to a more robust understanding of scientific uncertainties, [and] that may have the perverse effect of making the future less clear,” emails Pielke Jr.

I think this is the best outcome.  If science cannot make it clear beyond a reasonable doubt, we should not act – because we cannot know the outcome.  And don’t get me on about the “precautionary principle”, because that is like throwing darts in the dark.