Actually, people are dropping dead from the air quality in China. There are several WHO estimates that prove the PRC are obscuring how bad the situation is over there. As far as why we should worry, our way of life depends on the status quo. Sure, if it happens next year from our excesses, or in 10,000 years as a result of natural forces, it still happens. But, the population, agriculture, medicine, etc...all rely on the weather being just about where it is. Now, when the mercury goes up those three dreaded degrees, millions and millions will die from starvation, since much of the African farm lands will dry up. You might be so cold hearted to say "Well, then maybe they shouldn't have so many kids" but more people (I hope) won't have lost their humanity, and see them as people, and want to help. But, you say, I live in the West. Europe, Britain, the USA, [i]we[/i] have all the farmland we need. Not so fast. Remember your history lessons. The Dustbowl in the 30's drastically reduced produce in the US. It also displaced hundreds of thousands of farmers. This would almost certainly happen again. Look at what the current drought is doing to beef farmers as what the pattern would look like. So, the changes that will happen aren't for the best, and they aren't inevitable.