National Park Service, U.S. Department of the Interior National Park Service arrowhead
Mammoth Cave Guide Johnny Merideth leads Wild Cavers along Robertson Avenue, nearing the end of the 5-mile, 6-hour tour. Image courtesy of Gary Berdeaux.

MAMMOTH CAVE NATIONAL PARK

Vehicles and equipment used at Mammoth Cave National Park are 100 percent alternatively fueled. The park uses ethanol, biodiesel, and electric vehicles. The two river ferries run on biodiesel.
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www.nps.gov/parkoftheweek/photo-372.htm Updated: Monday, 18-Apr-2005 12:15:21 EDT
   
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