Credible science and data on this subject has only been collected for a couple hundred years at best. Current science allows us to make a guess at what happened before we actually started recording it, but it's just a guess. Does anyone have any data on how fast the earth was cooling during the ice age? I have no doubt the rate of warming is in large part caused by man (and not just North American man-go to China sometime and see how fast they are industrializing and without the clean air acts and such that we have).
And fbP, the environmental history of the earth is filled with natural recoveries from man caused damage. More often, though, we intervene and help it along.
My whole point is that I personally can do nothing about it so I'm not going to lose sleep over it.
I don't know if any of you guys that went to school in the 70's saw this movie or not, but there was this educational film they showed of this indian running around the earth, floating in his canoe seeing all the garbage man was dumping. It became a well known film and also a TV commerical when the indian was crying at the destruction man has caused. Dramatic. Well, in the film they stated that all these credible scientists said by 2010 the world would be so full of garbage that there would literally be no place to put it anymore. They used population growth rates as part of their theories. Well, you know? They were wrong. Way wrong. Not only on the garbage problem, but also the population growth. They didn't count on things like a flattening of the population growth, increased recycling, better biodegradable products, etc. I remain optimistic that man will find ways to improve the products we use to slow global warming. Blind faith? Maybe, but I'm not going to sit around being depressed about something I can't control. Hell, I could use a few more days of summer here in rainy and cold Seattle!



