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Originally Posted by DaveOrion
I dont think there is any real evidence to support this claim. Its also been theorized that the changing climate played a critical role in these species extinction.
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No actually, there is a ton of evidence to suggest that man was largely responsible for this. There had been many climatic shifts, some very extreme, prior to the arrival of the first Americans. The mammoths, big cats, and so on survived these climate changes. Yet within a few hundred years of man's arrival, the American mega-fauna was gone.
The same thing happened in Australia, Madagascar, and various islands all over the world. Native Americans, Aboriginals, Polynesians - they've all hunted species to extinction, many of them have brought ecological catastrophes upon themselves.
Tim Flannery is one author who writes on this subject.