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David Brower

1952

David Brower became the first Executive Director of the Sierra Club. Under his leadership, the Club became America’s foremost environmental protection organization.

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Sand County Almanac

1949

Sand County Almanac by Aldo Leopold published posthumously.

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Donora Zinc Works

October, 1948

An atmospheric inversion in Donora held the town under a cloud of gas from the Donora Zinc Works. Twenty people died. Public outcry over the incident forced the federal government to begin studying air pollution, it’s causes, effects, and how to control it. This led to the Air Pollution Control Act of 1955, the ancestor of the Clear Air Act of 1970.

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Wilderness Society

January, 1945

The Wilderness Society was founded. In the first issue of their magazine Living Wilderness, editor Robert Sterling Yard wrote, “The Wilderness Society is born of an emergency in conservation which admits of no delay. The craze is to build all the highways possible everywhere while billions may yet be borrowed from the unlucky future.”

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National Park Service

1916

National Park Service founded with Stephen Mather as President