Lester Brown and the Earth Policy Institute have released the third revision of their rigorous series of books on saving us from ourselves. Plan B 3.0: Mobilizing to Save Civilization. Follow the link to download for free or purchase a hardcopy.
I haven't had a chance to do much more than glance through it, but it appears to be a very worthwhile read considering the shit we're in. While I don't have a lot of faith in our ability to voluntarily change the way we live before things really get bad, I do think books like this are important because they at least help people understand the problems. Which in turn ought to help us take more reasoned measures as pressures mount, and hopefully minimise the sort of lunacy that might emerge when reality finally bludgeons some of the more touched members of our species.