13 février 2015
Ben Cook from Nasa's Goddard Institute for Space Studie
These mega-droughts during the 1100s and 1200s persisted for 20, 30, 40, 50 years at a time, and they were droughts that no-one in the history of the United States has ever experienced," said Ben Cook from Nasa's Goddard Institute for Space Studies雄性禿....