12 Factors Affect Earth's Temperature; Global Cooling Could be Greater Concern

How much impact mankind has had on earth’s temperature – which is the issue at the crux of current controversies – is hard to determine, according to [geologist Leighton] Steward. Of the 18 factors which impact earth’s temperature, mankind is probably the least of them.
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And, earth has been much colder than it is now. “Ithaca, New York was 1.8 miles under snow and ice just 11,000 years ago,” according to Steward.
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The movements of the continents more dramatically affect sea levels and have more immediate impacts than does CO2, said Steward. Earth’s continents move two to three inches a year, substantially less than the 7-9 inches they moved annually 100 million years ago.