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Money that grows on crops

csmonitor.com: "Use common crops to soak up contaminants in soil from gold-mining sites and return the areas to productive agriculture. The gold harvested from the process pays for the cleanup - with money left over for training in sustainable agriculture.

'We get the plants to do the hard work, and then we basically harvest the plants and extract the metal,' says Christopher Anderson, an environmental geologist from Massey University in Palmerston North, New Zealand. 'So we farm mercury and gold.'"

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