As China strives to be an economic colossus, hundreds of thousands of people are dying prematurely from un-breathable air and contaminated water. During next summer's Olympics, auto traffic and manufacturing will be curtailed in greater Beijing, and nearby coal mines may be shut down. American athletes may be housed in South Korea and flown to Beijing only to participate in their events. The International Olympic Committee says the marathon and other endurance contests may be postponed altogether. But the basic problem remains, that of mind-boggling expansion in the world's most populous country with few controls on waste and emissions. What does it mean for the rest of the world? What's China trying to do about it?