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In 2001, scientists began adding 5 to 6 nanograms per litre of synthetic estrogen to an Ontario lake; after 2 seasons its minnow population collapsed
A tiny concentration of a synthetic hormone was enough to trigger a dramatic ecological change in a remote Ontario lake. In 2001, scientists began adding the synthetic estrogen 17α-ethynylestradiol (EE2) to Lake 260 in northwestern Ontario, maintaining concentrations of about 5 to 6 nanograms per litre.