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COVER Clouds pass over Kenya's Lake Magadi, where geologists are 8 v) S d# C; S, ^- X2 Rdrilling a core to gather detailed climate data from the ancient lake bed. Data : U& R: Z9 k& R* J f. L
on past climates are vital for researchers seeking to understand how % O9 k$ \! k; yanthropogenic climate change will affect Earth?s ecosystems and species, % E ]4 L) A$ `! @% Eincluding its effects on infectious diseases and food security. See the special * a$ F0 K5 ~ @* {; f# F
section beginning on page 472. Photo: & r+ q& J2 T# `? Martin Harvey/Alamy . l. p4 i3 {+ Z8 u 作者: exin11 时间: 2013-8-2 10:48