Unusual trees-climate change link - 17/11/09
The world's oldest trees are growing bigger and bigger because of climate change, scientists say.
Research published in the journal Proceedings of the National Academy of Sciences claims that temperature rises witnessed since the 1950s have caused unprecedented levels of growth among Bristlecones, typically found in Calfornia's White Mountains.
The trees, some of which are up to 5,000 years old, had wider annual growth rings for the post-1951 period than for the previous 3,700 years, researchers said.
Study leader Dr Matthew Salzer, from the University of Arizona, explained: "We're showing this increased growth rate at treeline in a number of locations. It's unique in several millennia, and its related specifically to treeline."
The findings could have important implications for human populations, Dr Salzer said, adding that ethical living was the key to fighting climate change.
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