气候变化开始产生影响，我能很肯定的说，到本世纪中期，这将成为造成未来英国野生动植物灭绝的主要原因。

Climate change is beginning to have an effect, and by the middle of the century I am sure it will be accounting for the vast majority of future extinctions of English wildlife.

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研究人员称，到本世纪中期，全球人口将会稳定在90亿左右。

Researchers say the world's population will level off at about 9billion in the middle of the century.

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总之，战斗死亡人数从二十世纪八十年代中期的每年20万人减少到本世纪零零年代中期的2万人以下。

In total, the death toll in battle fell from over 200,000 a year in the mid-1980s to below 20,000 in the mid-2000s.

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