Found at Bishop Hill and reposted here so I can find it again.
“Somebody cited Margaret Thatcher, a lady of whom I am always happy to call myself a fan. In her book “Statecraft”, in a chapter called “Hot Air and Global Warming”, she actually repudiated much of what she had written when she pointed out that people were getting quite hysterical about this. I think she was absolutely right and I urge the Secretary of State to be very cautious when she gets to Paris, and to remember that there is a difference between healthy scepticism and denial.”
You can read the full debate in Hansard.