Pollution and Population

Greenhouse emmissions were ruled by the supreme court today to be a pollutant and a factor in global warming. The Environmental Protection Agency is now required to re-examine it's uncertainty on such gases eminating from cars and trucks, and to answer why they wouldn't regulate such emmissions or investigate alternative fuel sources. Well, why not when the population of the United States has reached it's 300 million mark in October of 2006.
Which is what I'm writing another scholarship essay on. If the population of the US is sustainable in the long term. My stance is that the population is sustainable in the long term, but with population increases, that sustainability is decreased. There's disease, poverty, and pollution to think about, not forgetting the simplist of resources: food, water, and land. However, I believe that human ingenuity and intellegence can overcome these odds and shrinking life supply to create a stable environment with enough resources. I mean, in China, the government rules that only one child is acceptable, and perhaps that may become a reality in America someday. However, it's more likely that the immigration policy will become strict, and our "loose borders" will tighten. That's the future of Americans though we know it not.