The water that runs off the hillsides, meanwhile, also increases peak river flows, eroding the banks and raising the risk of landslides.

山坡无法蓄水，也增加了长江的最高水位，侵蚀堤岸，易引发决堤。

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Though the theory is still up for debate, experts think this colossal canyon was formed 17 million years ago, when the Colorado River carved through the gorge, eroding the rock.

尽管理论尚处于争论之中，但专家们认为这条巨大的峡谷是一千七百万年前，科罗拉多河流横穿峡谷腐蚀岩石而形成的。

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Louisiana's wetlands have been eroding for years, for instance, the result of the damming of the Mississippi River and of coastal development, including for oil and gas drilling.

WSJ: Gauging Harm to Ecosystem Could Take Years