Science Global warming: How rising alpine vegetation could hit California water supply

A warming-climate-induced march of alpine vegetation up the sides of a river basin on the western slope California's Sierra Nevada could slash vital runoff, researchers say.

By , Staff writer

Rich Pedroncelli/AP

A warming-climate-induced march of alpine vegetation up a large river basin on the western slope of the Sierra Nevada could slash by one-fourth the annual flow of water the basin delivers to California’s thirsty Central Valley by the last two decades of this century, a new study says.