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Forest biologist Patricia Maloney is raising 10,000 sugar pine seedlings descended from trees that survived California's historic drought. Lauren Sommer / KQED

By Lauren Sommer

When California's historic five-year drought finally relented a few years ago, the tally of dead trees in the Sierra Nevada was higher than almost anyone expected: 129 million. Most are still standing, the dry patches dotting the mountainsides.

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