Getting plants to grow in the Sonoran Desert is made possible by importing billions of gallons of water each year. Cotton is one of the thirstiest crops in existence, and each acre cultivated here demands six times as much water as lettuce, 60 percent more than wheat. That precious liquid is pulled from a nearby federal reservoir, siphoned from beleaguered underground aquifers and pumped in from the Colorado River hundreds of miles away. Greg Wuertz has been farming cotton on these fields since 1981, and before him, his father and grandfather did the same. His family is part of Arizona’s agricultural royalty. His father was a board member of the Central Arizona Water Conservation District for nearly two decades. Wuertz has served as president of several of the most important cotton organizations in the state. ... But what was once a breathtaking accomplishment — raising cotton in a desert — has become something that Wuertz pursues with a twinge of doubt chipping at his conscience. Demand and prices for cotton have plummeted, and he knows no one really needs what he supplies. More importantly, he understands that cotton comes at enormous environmental expense, a price the American West may no longer be able to afford. ... The federal government has long offered him so many financial incentives to do it that he can’t afford not to. ... “Some years all of what you made came from the government,” Wuertz said. “Your bank would finance your farming operation … because they knew the support was guaranteed. They wouldn’t finance wheat, or alfalfa. Cotton was always dependable, it would always work.” ... The still-blooming cotton farms of Arizona are emblematic of the reluctance to make choices that seem obvious.