雨水比以往少了很多，而且土地过去一直被大型牛牧场过度使用。
There is much less rain than before and the land has been overused in the past by big cattle ranches.
他说，索马里的土地冲突、亚洲的沙尘暴和近几年的粮价危机都源于土地退化，而土地退化是由于人类对土地的过度使用和全球变暖的影响。
Land conflicts in Somalia, dust storms in Asia and the food price crises of recent years all stem from the degradation of land, he said, due to overuse by humans and the impacts of global warming.
而现在这些土地却所剩不多，并且剩下的许多也已经开始被过度使用了。
Now there's little of that, and much of what remains is embedded within intensively used landscapes.
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