Global warming blamed for tree death in West

Sacramento BeeJanuary 22, 2009 

Tree mortality rates have doubled in old-growth forests across the Sierra Nevada and western United States because of rising temperatures associated with climate change, a new study has found.

The study, which will be published Friday in the journal Science, suggests that if the trend continues, the region's majestic conifer forests may become younger, smaller and far more sickly -- making them vulnerable to massive die-offs from insect attacks and other causes.

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