Back in the late 40's, scientists were so concerned with the Earth's COOLING, that they were investigating possible ways to enhance melting of the polar ice caps (e.g. spread dark soot over the ice). And that was after scientists 80 years prior to that had been concerned about the Earth's WARMING....
It's all a cycle, perfectly natural, and of such massive proportions us little old humans have little or no impact on it.
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