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On The Cretaceous "Hot-house"
Mostly, the RealClimate blog deals with issues around modern AGW but this
concerns the apparent fact that
"...that there appears to have been a 200,000 year period right smack in the
middle of one of the warmest periods of the past half billion years, when
there were ice sheets (presumably in Antarctica) that were up to 60% the
volume of today's Antarctic ice sheets. How in the world do you get such
large ice sheets in a high CO2 climate warm enough for crocodiles to survive
in the Arctic at the other side of the planet? And this apparent glaciation
is not the result of a global cold snap. As in the Eocene results quoted
earlier, the tropical ocean surface temperatures are again on the order of
35C - courtesy once more of the wondrous Tex86 proxy."