I have just enjoyed listening to and watching this pair of lectures from the
Royal Society on the web. (There are actually two Tims giving talks.) I think
everyone would find them interesting, not just those worried about global
warming. Bill Giles gets a mention, and Piers Corbyn has a walk on part
in the question time at the end.
http://www.royalsoc.ac.uk/page.asp?id=3135

Cheers, Alastair.