Why societies collapse Jared Diamond

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=IESYMFtLIis

http://www.ted.com Why do societies fail? With lessons from the Norse of Iron Age Greenland, deforested Easter Island and present-day Montana, Jared Diamond talks about the signs that collapse is near, and how -- if we see it in time -- we can prevent it.

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