 NPR's Alejandra Burunda reports that is a worrisome mix. The U.S. produces more crude oil than any other country in history. Much of that production comes from wells in western states like Texas and Colorado, where the threat of wildfires has grown enormously in recent decades. That's a dangerous combination, says University of California Berkeley scientist David Gonzalez. Any uncontrolled flame near an oil and gas well is something to be concerned about.