今后40年，农用地将因城市化、沙漠化、海平面上升及咸水不断增加等因素而减少。
In the next 40 years, agricultural land will be lost to urbanization, desertification, sea level rise and increasingly salty water.
大概5000年前这片土地还是富饶的大草原，最近2000年持续不断的沙漠化改变了该国的地貌。
Over 5000 years ago the same land was actually covered with fertile grasslands - the desertification has took place in the last 2000 years.
几十年来，气候变暖使得绿地消失殆尽，过度放牧又加剧了草原的沙漠化。
The grasslands are dying out, as decades of warming temperatures-exacerbated by overgrazing-turn prairie into desert.
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