About ten or twelve years ago, I wrote a term paper on global warming. If past patterns hold true, right now the Earth is nearing the end of a 10,000 year warming trend, and within 2,000 years will enter another mini ice age.
At least once in the past, the Earth was some 14 degrees warmer than it is now, and scientists are going berzerk because the average temp rose a degree or so in the last century.
Does man have an effect? To put it into perspective, take the entire Earth. Subtract the area that is under water, both salt and fresh. Subtract all the the uninhabited/uninhabitable areas. Subtract the polar ice caps. Subtract all of the undeveloped countries that have no industry. Even in the U.S., something like 40% is wilderness with no industry. After you have subtracted all of that, the area left where man MIGHT have an effect is really very small.
My argument in the term paper was not that man had absolutely no effect on climate, but that if man did it would be miniscule.
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