The only thing that is certain about the earth's climate is that it has always been changing. It's never been constant and almost certainly never will. I believe man has some impact on the earth and its environment, but not one that changes the overall direction of the earth's cycles of change.
As others have said, it's important that we always take steps to minimize any negative impacts of societal development on the environment. But I also agree with others that to think man can totally control earth's environment and eliminate cycles of heating and cooling is unrealistic to put it mildly.
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