We know from experience that it is much harder to recover lost forest than it is to protect existing forest.

从以往的经验来看，恢复已经失去的森林比保护现有的森林要难得多。

youdao

Lost forest cover heats the planet, because trees absorb CO2 while they're alive -and when they're burned or cut down, the greenhouse gas is released back into the atmosphere.

消失的森林覆盖会加热地球，因为树木活着时会吸收CO2，当燃烧或被砍后，这些温室气体被重新释放到大气中。

youdao

Lost forest cover heats the planet, because trees absorb CO2 while they're alive - and when they're burned or cut down, the greenhouse gas is released back into the atmosphere.

消失的森林覆盖会加热地球，因为树木活着时会吸收CO2，当燃烧或被砍后，这些温室气体被重新释放到大气中。

youdao

About thirteen million hectares of forest were cut down or lost through natural causes each year in the last ten years.

VOA: special.2010.04.06

It was like the cry of a lost child in the far deep of the darkening forest!

VOA: special.2009.10.31

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The United Nations estimates some 13 million hectares of forest are lost worldwide each year, equivalent to an area the size of Greece or Nicaragua.

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In 2002, he got lost in a Wyoming forest in the dead of winter and after being saved had to have one of his toes amputated.

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