One of California's oldest environmental battles is on the San Francisco ballot. Hetch Hetchy Valley in Yosemite National Park holds most of San Francisco's water supply. But some environmental groups want to turn back the clock.
One of California's oldest environmental battles is on the San Francisco ballot. Hetch Hetchy Valley in Yosemite National Park holds most of San Francisco's water supply. But some environmental groups want to turn back the clock.
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