This 1923 photo shows how glamorous it used to be to swim in the Charles River (photo (c) Leslie Jones NEED PERMISSION). Within decades, the river would be closed to swimming & suffered from 3 distinct sources of pollution. With the EPA's Clean Water Act regulating industrial pollution, and work to separate sewage output, 2 of these sources have been largely curbed. The remaining task: mitigate algal blooms by addressing the root problem: lack of roots = lack of habitat for algae-eaters aka zooplankton.
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