伦敦政治经济学院(London School of Economics)的城市研究项目预计，到2050年，在城市居住的人口将再增加25亿，这将使城市总人口占全球人口的比重达到约三分之二。

On present trends these cities would be producing about four-fifths or more of the greenhouse gas being pumped into the atmosphere.

若目前的趋势延续下去，排入大气层的温室气体将有五分之四甚至更多是由城市制造的。

As the planet heats up, cities will fare the worst.

随着地球日益变暖，城市地区的状况将变得最为糟糕。

The Paris-based Organisation for Economic Cooperation and Development estimates that temperatures in urban areas already tend to be 3.5-4.5C higher than in the countryside.

据总部位于巴黎的经济合作与发展组织(OECD)估测，目前城市地区的气温通常已较乡村地区高出3.5至4.5摄氏度。

This difference could well increase by another 1C per decade.

未来这一温差很可能每十年扩大1摄氏度。

This would mean that, by the second half of the present century, some big cities could be as much as 10C hotter than their surrounding hinterlands.

这将意味着到21世纪下半叶，某些大城市的气温可能比周围内陆地区高出10摄氏度。

That begins to sound like unliveable.

大城市将因此逐渐变得不适宜居住。

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