This map supplements a National Geographic Daily News article about Arkansas power plants, demonstrating coal production trends across the continental U.S. The graduated symbols are scaled by million megawatt hours, and are labeled for the nine states showing an increase in coal power production (grey) since 2001. Arkansas came in second place to Nebraska for leading the nation in increasing reliability on the nonrenewable energy source, a contest for which there are no winners.

Credit: Emily Eng, NG Staff; Jamie Hawk, Joey Fening. Sources: U.S. Energy Information Administration; EPA; Platts, McGraw Hill Financial.