Native grasslands are being cultivated into cropland faster than at any time since before the Great Depression, according to the Center for Rural Affairs. Between 2011 and 2012—the most recent years data is available—nearly 400,000 acres of US grassland was converted to cropland. Nebraska topped the list of US states with more than 85 square miles of land being converted from native prairie to farmland in that single year.
Many playas on federal grasslands in southeast Colorado, southwest Kansas, New Mexico and the Oklahoma and Texas panhandles have pitted playas. There's a cooperative effort underway to rehab some of these playas.