No Rain: Scenes From California's Extreme Drought<p>The nation's most populous state faces extreme drought.</p>A sign advising water conservation greets drivers on California State Route 43 in Kern County, Calif. on Feb. 12.John Brecher / NBC NewsPrintFeb. 17, 2014, 4:33 PM UTC / Updated Feb. 17, 2014, 7:08 PM UTC