The ancient giants of Yosemite, under a billion stars

The Mariposa Grove of Giant Sequoias, at the heart of California's Yosemite National Park, is home to 500 of the towering trees—many at least 2,000 years old, having sprouted around the time of Jesus Christ.

Drones help monitor health of giant sequoias

Todd Dawson's field equipment always includes ropes and ascenders, which he and his team use to climb hundreds of feet into the canopies of the world's largest trees, California's redwoods.

Group clones California giant trees to combat climate change

At the foot of a giant sequoia in California's Sierra Nevada, two arborists stepped into harnesses then inched up ropes more than 20 stories into the dizzying canopy of a tree that survived thousands of years, enduring drought, ...

Scientists: Drought stressing California's Giant Sequoias

Giant Sequoias growing in California's Sierra Nevada are among the largest and oldest living things on earth, but scientists climbing high up into their green canopies say they are seeing symptoms of stress caused by the ...

Dying giant sequoia planted by Muir is cloned

Horticulturists recently announced that they had successfully cloned a genetic replica of an ailing 130-year-old giant sequoia planted by conservationist John Muir in the 1880s on his ranch in Martinez, Calif.

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