I would say that in part it is a natural progression, but we are speeding the progression. I also believe that the earth has been through a lot more, and soon any and all human existance will be wiped free either from man made destruction or natural causes and after another 5-7 hundred million years life will reinvent itself again. its happend before in the earths cycle and it will continue to happen. i have no solution for stopping global warming, as someone said the earth is overpopulated, and thats a major issue. but i know for sure that humans are speeding the process of global warming and it could very well be the end of human civilization as we know it. maybe not in our lifetimes, but in our childrens or childrens children if we continue to destroy the atmoshpere at the rate we have been.
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