STEAMBOAT SPRINGS, Colo. (AP) -- They killed Kenny but not too many trees.

The creators of "South Park" are showing off their environmentally friendly mansion in western Colorado. The $5 million Steamboat Springs home belonging to Trey Parker and Matt Stone features "green" building techniques.

Ceilings are made of Douglas fir timbers salvaged from a rail trestle that once spanned the Great Salt Lake. The home also uses recycled carpet and in-floor, radiant heating.

The timber-frame home on 2 acres overlooks the Steamboat Ski Area. The architect of the home built in 2007 says Parker and Stone wanted a relaxing retreat. He also designed a home for them in Kauai, Hawaii.

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