it. feedback is always amazement. they don't believe that it's in san francisco. we have visitors who will say, i never knew this was here and i'm a native san franciscoan. they wonder how long it's been here. when i tell them next year we'll get to celebrate the 80th anniversary of the park, . >> my name is mark tieman and i'm senior councilor at pet camp, san francisco, california. we dispose of a lot of

carbon-based material here, dog poop, and the more we can turn that into something viable, the better off we are. in san francisco there's more dogs than children. finding a viable use for dog poop. >> proenvironmental policies, that's a way to win hearts and minds.