Silent Running (1972)6.6 /10

Storyline:  On a future Earth where nature survives only in spaceborne pods, botanist Freeman Lowell is devastated when ordered to destroy the last forests. Unlike his crew, he refuses to give up, kills them, and escapes into deep space. Alone with three small robots, he clings to the beauty of nature—until a rescue mission forces him to make a final, irreversible choice.