Is man made climate change tougher to swallow if you think about this?

If you consider the fact that much of North America was once covered by glaciers, which melted and receded long before humans became a factor, which means the earths climate has changed on it's own before in history, many times, doesn't that put a damper on the people saying that global warming..oops excuse me now its climate change, is man made?
 
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