Suppose you are talking to a friend about extinctions, and you mention that humans are known to have caused thousands of extinctions in the last few millennia. Your friend responds, “So? Extinction is natural. Species have always gone extinct. So it’s really not something we need to worry about.” Is your friend correct that extinction is natural? Is the current rate of extinction typical? Is your friend correct that if extinctions are natural, then they are not a problem for the dominant life-forms on Earth?
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