Listen to the call of the wild: the whistle of hawks and the whir of helicopters. The growl of grizzlies and the groans of chain saws. Gaze upon the glories of nature: fleet-footed antelope and wide-wheeled ATV's. Towering mountains and low-slung condominiums. Packs of wolves and parades of Winnebagos.
Once, visitors to the Grand Canyon could see mountains a hundred miles distant; now the air can be so smoggy that it is hard to make out the opposite rim. Once, Yosemite offered respite from civilization's excess; on Memorial Day a major entrance to the park had to be closed because of...
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