Another skeptic who seems to be flailing is Fred Singer; extracts from an answer he gave to question on global warming:
Tilting at Warming
Oh dear, seems the poor fellow’s gotten stuck in a quagmire; almost seems he’s thinking of how ridiculous his comments are even as he makes them. Global warming fears aren’t about any wishy-washy notion of “optimum climate” – but about major changes to the climate we’ve long had. As a commenter notes on blog with the quote, we have cities on seacoasts, crops suited to existing climates etc.