Up to one fifth of the Amazon rainforest is emitting more CO2 than it absorbs, new research suggests.

最新研究表明，多达五分之一的亚马孙雨林排放的二氧化碳比吸收的还要多。

Results from a decade-long study of greenhouse gases over the Amazon basin appear to show around 20% of the total area has become a net source of carbon dioxide in the atmosphere.

对亚马孙流域温室气体的一项长达十年的研究结果显示，该流域中大约有20%的地区已成为大气中二氧化碳的净来源地。

One of the main causes is deforestation.

造成这一现象的主要原因之一是森林砍伐。

While trees are growing they absorb carbon dioxide from the atmosphere; dead trees release it again.

树木生长时，会从大气中吸收二氧化碳，死亡的树木会再次释放二氧化碳。

Millions of trees have been lost to logging and fires in recent years.

近年来，数百万棵树木被砍伐或被火灾烧毁。

The results of the study, which have not yet been published, have implications for the effort to combat climate change.

这项尚未发表的研究结果对应对气候变化的努力具有启示意义。

They suggest that the Amazon rainforest - a vital carbon store, or "sink", that slows the pace of global warming - may be turning into a carbon source faster than previously thought.

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