How California is dealing with its drought

California is in the grip of its worst drought in over a thousand years with no significant rainfall in about four years, and only about a year's supply of water left in its reservoirs. Water restrictions imposed by the state's governor are meant to cut water consumption in urban areas by a quarter, but with agriculture taking up 80 percent of California's water - and only delivering 2 percent of its wealth GDP - there are questions about how agribusiness has put the squeeze on precious water resources and is getting an unfair share. Mark Hertsgaard has reported on politics, culture and the environment from more than 20 countries and has authored six books, including HOT: Living Through the Next Fifty Years on Earth (published April 2015, paperback).