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Re:Ask HN: Interesting sci-fi movies BY TOPIC? by b0rsuk on Tuesday March 10, 2020 @12:50PM (#22537082)
Topic: Environmentalist / Ecology
Re:Ask HN: Interesting sci-fi movies BY TOPIC? by fetus8 on Tuesday March 10, 2020 @04:09PM (#22539133)
Annihilation (2018): A biologist signs up for a dangerous, secret expedition into a mysterious zone where the laws of nature don't apply.

Could fall into a few different categories but...

Re:Ask HN: Interesting sci-fi movies BY TOPIC? by b0rsuk on Tuesday March 10, 2020 @03:45PM (#22538868)
Silent Running (1972)

A space ark. A major stylistic influence on ones like Star Wars and Alien.