From A Jacksonian, trained as a geologist, on how science works and doesn't work:
The very first warning signs on Antrhopogenic Global Warming (AGW) and just plain old GW came from the paleoclimatologists who tried to run the models made for AGW/GW against known climates and what those models would predict for those climates. The models came through with junk, not even getting close to the actual climates they were tested against. When the paleoclimatologists asked for the datasets from those pushing AGW (mainly EA CRU, but elsewhere) they were stalled and rebuffed. Coming just after the K-T event and its aftermath, paleoclimatologists were not slow in criticizing the models, how they did not form into anything resembling known past climates nor did the models explain how those climates changed.
AGW/GW advocates refused to come out an play in the full contact body sport that was geology.
They retreated to the hothouse of academia, environmentalism and seeking to 'extract' government grants for their perfect theory of how bad man was to planet Earth. Apparently they couldn't model how nasty Earth was to life forms during the Permo-Triassic that saw over 95% of all species perish... but then geologists don't put an anthropomorphic form of the Earth on a pedestal and worship her. If you DID anthropomorphize the planet it would come out looking far worse than Pol Pot and all other mass murderers, combined, with just a hint of Charles Manson thrown in for fun. But then those seeking to castigate man don't bother to look at Earth's history, either.