Paul Hockenos: A hotter climate demands that we clean up our rivers for swimming

Many American urban rivers are so polluted that swimming in them is illegal. Munich’s purified Isar River is a success to behold.

The Isar River in Central Munich, photographed between May 29-June 22, 2023. (Sandra Singh for The New York Times)

The Isar River in Central Munich, photographed between May 29-June 22, 2023. (Sandra Singh for The New York Times)

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By Paul Hockenos | For The New York Times