Air Date: Week of June 21, 1991
Summer has arrived and frugal-minded, ecology-conscious vacationers are foregoing traditional amusement parks for the real thing: national parks. But their increasing numbers are wearing on the parks' resources and increasing pollution and traffic in the fragile park environments. Betsy Bayha reports on the effects on one of America's most famous and most vulnerable national parks: Yosemite.
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