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Originally posted by UFOTECH
I guess you have not heard of the woolly mammoth found frozen in the arctic with its mouth and belly full of green grass and leaves indicating that this frozen area it was found in was once covered in vegetation. In fact the entire region has been thawed out in the past.
During one warm period Greenland was thawed out and was under cultivation in fact.
One eruption of a large enough volcano releases more greenhouse gas than all of human contribution since the beginning of the industrial age.