Using a relatively new scientific dating technique, geologists were able to document — for the first time — a drastic climate change 4,200 years ago in northern China that affected vegetation and led to mass migration from the area.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/RumUd2E_EGY/150216160005.htm
First-ever evidence of climate change of Northern China region dating back thousands of years
16 febrero 2015
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