Climate change threatens California water supply

California's tallest mountain range, the Sierra Nevada, may lose nearly all its snowpack by the end of the century, threatening a water crisis in the nation's most populous state, a leading scientist and Nobel laureate said.

California could lose 30 percent to 70 percent of the snowpack to the ills of greenhouse gases and global warming, Steven Chu, director of the Lawrence Berkeley National Laboratory and the 1997 winner of the Nobel Prize in Physics, told Reuters.

A "bad scenario" of atmospheric carbon could mean the loss of 70 percent to 93 percent, Chu said in an interview, citing published climate models.

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