第三个来源，特别是在中纬度和高纬度地区，森林和土壤中因气候变暖而加剧的有机物腐烂，现在被认为具有潜在的重大意义。

A third sources, the warming-enhanced decay of organic matter in forests and soils, especially in the middle and higher latitudes, is now being recognized as potentially significant.

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从理论上说，任何成木都能做到这一点，尽管它们也会枯萎腐烂，但是更大的森林覆盖将会锁住更多 的二氧化碳。

In principle, any old trees would do—although they die and rot, more forest cover would lock up more carbon dioxide.

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但是，树木被种植以后可能会死亡、腐烂或者发生森林火灾，也就会把他们储藏的二氧化碳重新放回大气层。

But trees, once planted, can die and decay or be chopped down for firewood, releasing the carbon they stored back into the atmosphere.

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