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It used to be that camping was the ultimate “green” activity. But many now enjoy the great outdoors in the comfort of giant motorhomes, which suck-up a lot of energy.

For this Earth Day, National Public Radio visited a KOA campground in Flagstaff, Ariz., that’s working hard to reduce its carbon footprint. In the process, it’s becoming a national model for “green” RV camping. Arizona Public Radio’s Gillian Ferris Kohl reports.

Click here to hear her report.