太平洋岌岌可危
Yesterday, that is to say, more than six hundred million years ago, Pangea was formed, the last single...
花粉阻碍降雨
An American study shows that certain fine pollens could make drought worse in the regions concerned, as they...
部分大气层正在下沉
Greenhouse gas emissions have two seemingly contradictory consequences. On the one hand, they contribute to global warming on...
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