众所周知，大面积的森林砍伐会导致洪水泛滥。
It is widely acknowledged that extensive deforestation would lead to flooding.
与此同时，下游地区则面临着堰塞湖突然溃坝导致洪水泛滥的风险。
Meanwhile, downstream communities faced a risk of a flood should the landslide lake break through the earthen dam suddenly.
全球变暖也在加快地球水循环速度，降雨周期拉长，强度增大，既能导致洪水泛滥，也会促成连日无雨的旱情。
Global warming also seems to be speeding up the earth's hydrologic cycle, causing both floods and droughts (more rains fall in shorter periods, with longer gaps between).
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