When David Backes was a disillusioned student at the University of Wisconsin in 1977, he wrote to his hero, environmentalist activist and nature writer Sigurd Olson, who promptly wrote back to say, simply, “Stay in school.” The exchange inspired Backes to become Olson’s biographer and lifelong champion, and, many years later, to write a note of support to the Olson of her day, Greta Thunberg.

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