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Arid lands

Arid lands

作者:居佥薹  时间:2019-03-07 01:04:02  人气:

By Fred Pearce AFRICA’s lethal droughts of the past 30 years have been puny compared with arid spells in previous centuries, according to a pioneering reconstruction of the climate using lake sediments in East Africa. Those centuries saw huge swings in African rainfall, says Dirk Verschuren of the University of Ghent in Belgium. “The fluctuations seem to be tied to variations in the radiative output of the Sun,” Verschuren told New Scientist. “Higher solar radiation is linked to droughts in equatorial East Africa.” Regionally,