100 Years Of The Sierra Club / Tom Turner| hosted by Leslie Baer-Brown. - SERIES: Earthwatch| no. 21 - Series which explores environmental problems and solutions from around the world. - CONTENT: Tom Turmer, author of a book celebrating the Sierra Club's centennial, discusses the successes, failures, and continuing challenges faced by that pro-environment organization. Bob Rhein provides tips on environmentally safe ways to beat bugs in a segment called Earth Action Report. - BROADCAST: Satellite, 21 Nov. 1991.