Many things other than rainforests or drylands share these attributes.

除了热带雨林和干旱地带之外，许多其它东西都有着这样的性质。

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"Increased aridity is making the drylands the most conflict prone region of the world," he said.

“干旱的增加正使旱地成为世界上最容易发生冲突的地区，”他说。

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Almost 20 per cent of drylands have lost productive capacity in recent years because of human activity and climate change, the paper reports.

这份报告说，将近20%的旱地由于人类活动和气候变化而在近年来失去了生产能力。

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Most of Australia is also classified as drylands, along with much of the western U.S., parts of southern Africa, and patches of desert in South America.

CNN: Growing deserts 'a global problem'

Drylands, which range from "dry sub-humid" to "hyper-arid" regions, make up more than 40 percent of the world's land surface and are home to two billion people.

CNN: Growing deserts 'a global problem'

Desertification has also been linked to health problems caused by dust storms, poverty and a drop in farm production, with infant mortality in drylands double the rate elsewhere in developing nations.

CNN: Growing deserts 'a global problem'