The Future of Energy Has Arrived — Just Not in the U.S.

For the first time in 30 years, the annual U.N. conference on climate change is taking place without top government representation from the United States. China has emerged as the top dog at the summit and is poised to become the world’s supplier of green energy technology. David Gelles and Brad Plumer explain the growing showdown between global superpowers over the future of energy.