He was deeply engaged with some of the late 20th-century's most pivotal environmental issues, and did so as a Republican stalwart -- Richard Nixon, for example, appointed him as the EPA's second administrator.
Since the mid-19th century, Yosemite has been lauded as America's wonderland, its playground -- beguiling, transformative, divine. It is also a tourist trap. A new exhibit probes the connection between these two sides of Yosemite.
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