Gene Callahan has an interesting post, entitled "How a Free Society Could Solve Global Warming", in the October 2007 issue of The Freeman: Ideas on Liberty, at the website of The Foundation for Economic Education (FEE): http://www.fee.org/publications/the-freeman/article.asp?aid=8150.
I will revist this and post comments later.
Thanks to Fundamentalist, who brought this to our attention on the Malthus and Mein Kampf thread.