Silent Running (1971)
Starring: Bruce Dern, Cliff Potts, Ron Rifkin
Directed By: Douglas Trumbull
Link to Trailer: [youtube]
The Plot: In a future where all flora is extinct on Earth, an astronaut is given orders to destroy the last of Earth’s botany, kept in a greenhouse aboard a spacecraft.
Comments: Another Bruce Dern movie that came out at the same time as The Incredible 2-Headed Transplant. This one seemed more believable than your average 70s sci-fi film. The effects are very, very good. Douglas Trumbull designed the effects for 2001 A Space Odyssey before directing this movie.