Green ski home for "South Park" creators

I'm a big fan of "South Park" and Trey Parker and Matt Stone, but I've never really pegged the two guys as being environment advocates, but apparently they are. They have a ski home in Steamboat Springs, Colorado, with ceilings made of Douglas fir timbers that came from a rail trestle along the Great Salt Lake. The house also uses recycled carpets and radiant heating.