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生长在北美西南部沙漠地区的约书亚树，从250万年前的更新世就出现在地球上，历史比猛犸象还要悠久。但一项新研究表明，如果不采取强有力的行动控制全球变暖，这种古老树种可能在本世纪末之前就会灭绝。
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President Xi: China and France should jointly prevent a new cold...
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