USGS global change science strategy: A framework for understanding and responding to climate and land-use change - Burkett, Virginia; Taylor, Ione; Belnap, Jayne; Cronin, Thomas; Dettinger, Michael D.; Frazier, Eldrich; Haines, John; Kirtland, David; Loveland, Thomas R.; Milly, Paul C.D.; O'Malley, Robin; Thompson, Robert (Open-File Report, 2011)