专家预测，高污染、低效率的内燃机，在五十年内会被比较环保的能源转换器取代。
Experts predict that the highly polluting, grossly inefficient internal combustion engine will be superseded by a more environmentally friendly energy converter within 50 years.
随着2009年结束，气候形势似乎更加严峻，超出了人们的想像——如果再不改变现状，那么在五十年内，气温肯定会上升4度。
As 2009 ends, the climate situation appears to be worse than anyone had thought, with 4c temperature rises a certainty within 50 years if nothing changes.
环境部国务大臣希拉里·本恩在会议上表示，预计在未来五十年内全球人口将从目前的六十二亿增加到九十五亿。
Hilary Benn, the environment secretary, said at the conference that the world’s population was expected to grow from 6.2bn today to 9.5bn in less than 50 years’ time.
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