Did Cruel Humans or Climate Change Kill the Mammoths?

Apparently biologists are split as to if humans or climate change killed off prehistoric creatures like like mammoths, giant sloths and saber-toothed cats. These creatures known as megafauna all died out at about the same time early in human history. In this interesting clip professor Elizabeth Hadly gives an overview of the debate which can be seen in full here.

Giant Sloth

Above: The Giant Sloth looks like a cute creature from Star Wars, no?