What's the oldest tree on Earth—and will it survive climate change?

Bristlecone pines in the western U.S. have been alive for nearly 5,000 years, but an upstart Patagonian cypress challenges that record.

This 1,400-year-old bristlecone pine on Mount Washington in Nevada’s Great Basin National Park is so iconic its image is stamped on the back of some U.S. quarters. For decades, bristlecone pines, which can survive for up to 5,000 years, were thought to be the planet’s oldest living things. Now a tree in Chile is posing a challenge. 

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