Debbie Ziegler holds a photo of her daughter, Brittany Maynard, as she receives congratulations from Ellen Pontac, after a right-to die measure was approved by the state Assembly, Wednesday, Sept. 9, 2015, in Sacramento, Calif. Rich Pedroncelli/AP hide caption

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Fields of carrots are watered March 29, 2015, in Kern County, Calif. Subsidized water flowing in federal and state canals down from the wet north to the arid south helped turn the dry, flat plain of the San Joaquin Valley into one of the world's most important food-growing regions. Frederic J. Brown/AFP/Getty Images hide caption

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Morning traffic makes its way toward downtown Los Angeles along the Hollywood Freeway, past an electronic sign warning of severe drought. California Gov. Jerry Brown introduced the state's first mandatory water reduction measure this week. Richard Vogel/AP hide caption

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