As American automakers lose market share, Honda and Toyota are soaring on the backs of their high-quality low-emissions vehicles. The increasing trend toward clean car technology means those companies that can build the best low-emission car will have the best chance of long-term success and survival. "Clean Car Wars" presents a revealing look at the Japanese auto industry and how its two biggest automakers are battling each other, and the world, for supremacy of this vital emerging market.