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Originally Posted by uno
How bout humans being a contributor?
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http://en.wikipedia.org/wiki/Global_warming
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The earth has experienced natural global warming and cooling many times in the past. The recent Antarctic EPICA ice core spans 800,000 years, including eight glacial cycles with interglacial warming periods much hotter than current temperatures. The chart also shows the time of the last glacial maximum about 20,000 years ago.
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I am sure those cavemen factories really contributed to the rise back then.