但是假如风持续的以一个相同的速率增长的话，那么在本世纪中叶，飓风将变得更具破坏力。

But if winds continue to pick up at the same rate, hurricanes could become far more damaging by the middle of the century.

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美国地质调查局2007年进行的一项研究发现：如果北极地区的冰层持续融化，那么地球上三分之二的北极熊在本世纪中叶前就可能消失。

A 2007 study by the U.S. Geological Survey found that two-thirds of the polar bears on the planet could disappear by mid-century if Arctic ice keeps melting.

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2050年将世界人口稳定在80亿或80亿以下。 通过自发主动减少出生率，将改变人口以现在的增长速度在本世纪中叶突破90亿的推测。

Stabilization of the world population at 8 billion or below by 2050, through a voluntary reduction of fertility rates, rather than the current trajectory of more than 9 billion by midcentury

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