Hello Elmer Quinn!
That movie struck me as a kid in the 1970s - the message of conservation
and the juxtaposition of folk music in space. Was that Joan Baez?
Yes Joan Baez song was at the end of the movie.
It's actually a Peter Schickele song, but only sung by Baez.
https://www.schickele.com/wp/works/recordings/silent-running- original-soundtrack-album/
Baez = a distinctive confident voice, good choice!
--
../|ug
--- OpenXP 5.0.64
* Origin: Join MOVIES =
https://tinyurl.com/ydjv9chf (2:221/1.58)