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Extreme wildfires have destroyed about one-fifth of all giant sequoia trees. To safeguard their future, the National Park Service is planting seedlings that could better survive a hotter climate.

At around 4,440 acres, the Washburn Fire is far from the largest blaze Californians have seen in the past few years. But it has attracted national attention, in part because it's burning near Yosemite National Park's iconic giant sequoia trees.