The majestic old trees of the western US are disappearing twice as fast as they were three decades ago, and climate change is probably to blame.rnPhilip van Mantgem of the US Geological Survey and colleagues collected data from old forests on the West Coast as well as in Arizona, Colorado and Idaho. In 87 per cent of the study sites, trees are dying faster than replacements can spring up.
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机译：美国西部雄伟的老树消失的速度是三十年前的两倍，气候变化可能是罪魁祸首。美国地质调查局的菲利普·范·曼特姆（Philip van Mantgem）及其同事从西海岸以及在亚利桑那州，科罗拉多州和爱达荷州。在87％的研究地点中，树木的死亡速度快于替代树木的萌芽速度。
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