It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.

据估计，地球表面另外四分之一的土地正面临沙漠化威胁。

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The deserts, which already occupy approximately a fourth of the Earth's land surface, have in recent decades been increasing at an alarming pace.

沙漠已经占据了大约四分之一的地球表面积，近几十年来还在一直以惊人的速度增加。

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Globally, forests now cover about 31% of the Earth's land surface.

就全球而言，目前森林覆盖约占地球陆地面积的31%。

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That is the lowest point on the earth's land surface so this dramatic drop in just a very short geographical area.

这是地球陆地表面的最低点,这急剧下降是在很短的地理范围内。

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With just 0.2% of the earth's land surface, it hosts 18% of its bird species.

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With other rainforest regions such as the Amazon also being depleted rapidly -- the percentage of the earth's land surface covered by rainforest is estimated to have slipped from 14 percent to around six percent -- the sudden disappearance of millions of hectares of the earth's natural defenses against climate change is likely to have consequences far beyond local communities and wildlife.

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Since oceans cover two-thirds of the Earth's surface, it's more likely debris will hit water than land.

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