Up to __________( 五分之一的英文表达 ) of the Amazon rainforest is emitting more CO 2 than it absorbs, new research suggests. 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. One of the main causes is deforestation. 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。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。造成这一现象的主要原因之一是森林砍伐。