[Drew]

Okay, but here is one of the problems I've always had with this whole situation.

In terms of temperature variance, it is proven that the Earth has endured rises and drops in temperature exceeding 10 degrees Celsius. So if we have seen a .6-.9 degree increase over the course of a century, how is this worrisome in terms of the human race? Sediment samples have shown that Earth has - long before recorded human history - been both much hotter and much colder than what we've seen in the last century and even what we'll see in the next 100 years based on our current trend.