...latest study, released early on Monday (GMT), concludes that the average temperature of the Earth's land has risen by 1.5C (2.7F) over the past 250 years.
...In a piece authored for the New York Times, Prof Muller, from the University of California, Berkeley, said: "Three years ago I identified problems in previous climate studies that, in my mind, threw doubt on the very existence of global warming.
"Last year, following an intensive research effort involving a dozen scientists, I concluded that global warming was real and that the prior estimates of the rate of warming were correct. I'm now going a step further: Humans are almost entirely the cause."...
Full story and access to lot of data, analysis, comment and debate via the BBC report here. Arguably it is because Prof Muller et al had a moderate, practical, pragmatic scepticism that he reasoned that a change of mind was justified by the evidence. Long may moderate, practical, pragmatic scepticism reign.