China has now become the world's biggest consumer of energy. Because of the recession, it overcame the US five years sooner than anybody expected. That means more competition for limited resources, more clout for countries the US doesn't like, and, in the short run, more environmental pollution. What will it mean for green technology, especially if the US continues to lead the way in research while China does the manufacturing? We look at the vast implications of what's being called "a new age in the history of energy."