As California enters into its fourth year of extreme drought, water regulators on Tuesday adopted the state’s first rules for mandatory cutbacks in urban water use, announcing it would reduce city and town water use by 25 percent. Urban users will be hardest hit by the water regulations, even though they account for only 20 percent of state’s water consumption. The state’s massive agricultural sector, which the Public Policy Institute of California says uses 80 percent of human-related consumption, will be exempt.

That’s because the drought’s toll has had a disproportionate impact to the agricultural sector in particular. A recent survey by the U.S. Forest Service estimates that 12.5 million trees have died as a result of the drought. Livestock, cows in particular, are being affected as the grass they’re used to grazing on dries up. According to the U.S. Geological Survey, it takes 150 gallons of water to make a 1/3-pound hamburger.

Reuters photographer Lucy Nicholson’s aerial photographs of California’s Central Valley show the stark contrast in the amount of lush vegetation to dried grass and brittle trees next to them.