Climate change accelerates water hunt in U.S. West

There is very little water left untapped and global warming, the gradual increase of temperature as carbon dioxide and other gases retain more of the sun's heat, has created new uncertainties.

Global warming pushes extremes. It prolongs drought while sometimes bringing deluges the parched earth cannot absorb. California Department of Water Resources Director Lester Snow says two things keep him up at night: drought and flood.

"It isn't that drought is the new norm," said Snow. "Climate change is bringing us higher highs and lower lows in terms of water supplies."