他们排干沼泽地的水，将它变成了肥沃的土地。
人类还通过排干沼泽和开山修建公路和铁路来改变地球的面貌。
Man has also modified the face of the earth by draining marshes and cutting through mountains to build roads and railways.
在俄罗斯，据估算，为了排干沼泽而溢漏的二氧化碳每年可达到一千六百万吨。
In Russia such drainage is reckoned to free 160m tonnes of the gas every year.
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