MCAS Miramar celebrates Earth Day - Dump trucks empty trash into a pit where the waste will be converted into energy and used on the installation at the landfill on Marine Corps Air Station Miramar, Calif., April 10. MCAS Miramar sources 54% of its total energy consumption from on-site renewable energy sources, such as the landfill. (U.S. Marine Corps photo by Cpl. Victor Mincy/Released)