Here's a strange TV special that ran on NBC in 1973 (it says) and which appears nowhere in the IMDB or almost anywhere else online. It's called Keep America Beautiful and it stars Raymond Burr, Ruth Buzzi, Tim Conway, Don Knotts, Lena Horne, Sandy Duncan, The Muppets and a whole bunch of Boy Scouts. It was produced by a lot of the same folks who were then putting on Flip Wilson's weekly variety series. Flip, Redd Foxx, Carol Burnett and some other stars also make appearances.
Basically, it's comedy sketches and songs urging people not to pollute…certainly a worthy cause. If you actually watch it, you can decide for yourself how well they did it. My feeling is that a light-hearted comedy show may not be the best vehicle to get people to care about a serious problem.
If you just want to watch The Muppets, try this link. They have a pretty nice little spot. If you want to watch the whole thing, click below…