www.flickr.com 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? 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.
