October 19, 2008 8:36 PM

Shrinking Yosemite glacier spells trouble for California

As signals of climate change begin to come into focus in the Sierra Nevada, its melting glaciers spell trouble in bold font. Not only are they in-your-face barometers of global warming, they also reflect what scientists are beginning to uncover: that the Sierra snowpack – the source of 65 percent of California's water – is dwindling, too.

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