Cleansing the world’s waters

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More than 10 years ago, scientists treated a remote experimental lake with the synthetic estrogen used in birth control:

The hormone all but wiped out the fathead minnows, a major food source for lake trout, the lake’s top predator. Carried out in Ontario, Canada, this experiment revealed hazards of water pollution that require no toxic waste dump—just excretion of common household drugs and other chemicals into the sanitation system.

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