KINGS CANYON NATIONAL PARK, Calif. — Every June, Tony Caprio and his wife, Linda, hike into the Sugarbowl — a cluster of giant sequoias high in the Sierra Nevada — to admire the profusion of wildflowers and walk among some of the oldest and tallest trees on the planet. Now when he visits, he sees something that, scientists say, has no precedent in thousands of years of history: vast acres of dead sequoias, killed by fire.
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