Thradio368This Week on TreeHugger Radio: Coop America has designed a 12-step program for greener living and lightening the shadow of climate change. Joseph Romm, physicist and author of Hell and High Water, talks about how global warming begins as a political issue. Also, as Wal-Mart continues to profile itself as a green leader, the big-box giant’s vice president for corporate strategy and sustainability, Andy Ruben, hints at where it’s all headed. LISTEN (7 min)