I think voting for Bill Richardson would be a pretty bad idea, but much credit to him for noting that "land use policy" is something we need to improve to deal with global warming. This is the aspect of the issue that few people in politics seem to want to talk about. In a big-picture sense, all of the candidates have excellent positions on climate change issues so there's very little to debate here.
This article available online at:
http://www.theatlantic.com/politics/archive/2008/01/idiosyncratic-interest-blogging/47773/