Damian Carrington looks at best selling books on the environment. Apparently the top seller for 2010 was The Vanishing Face of Gaia, which shifted 5200 copies.
I did a double take since The Hockey Stick Illusion has sold slightly more than this, although I'm not sure we are comparing like with like - the 5200 figure may be UK-only and many of my sales have been to the US.
It will certainly be interesting to see whether I get a name-check in any of the "books of the year" articles that are coming our way.