See also “Climategate” and the Social Validation of Knowledge.
... it’s important not to overstate the case. I don’t think we have anywhere near enough evidence to show that the academic consensus on global warming is completely bogus, or even close to it. Nor has it been proven that all or most prominent scientific supporters of global warming theory are as unethical as those exposed in this scandal.
On balance, therefore, I still think that global warming exists and is a genuinely serious problem. But I am marginally less confident in holding that view than I was before. If we see more revelations of this kind, I will be less confident still.