sludge

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Clean energy's dirty secret: How push for modern technology has made Chinese pond toxic

A tailings pond lies on the west of the Chinese city Baotou, one filled with a black grey sludge of toxic and radioactive material.
Can sludge from dams turn deserts into farmland?

Can sludge from dams turn deserts into farmland?

Afforest for the Future is one of a series of projects trying to create arable land from sand. Its method: use the muck that collects behind dams to create new soil.

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