中科院水土保持研究所教授穆兴民告诉《卫报》记者说，人口的过度增长是水土的问题的主要原因。
Professor Mu Xingming of the Institute of Soil and Water Conservation told the Guardian that overpopulation was largely to blame.
穆兴民说， 为了恢复林地与草原我们要做的还有很多 他还说， 如果人类想要某些地区完全恢复的话， 就必须退出这些地区。
Mu said more work was needed to restore forests and grasslands and suggested humans would have to leave some areas entirely if they were to recover.
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