A North American generates several times more CO2 than an Indian or a Chinese person. Second, China has a one child policy, and you say they are overpopulating? All of Europe's overpopulated countries moved their people to the Americas, for the last 300 years. If everyone of British, Irish, German, French, Spanish, Portuguese, Polish, etc origin moved back to their home country, there would be instant third world slums all over Europe.