Check out “Silent Running” (1972) - its about preserving Earth’s last forests in space greenhouses and has some amazing solarpunk-adjacent vibes despite being made decades before the term existed.

Many Miyazaki movies have solarpunk themes, but Nausicaä of the Valley of the Wind is probably the best example.

We have been discussing some related books and movies in our [email protected] community, but AFAIK there are no explicitly Solarpunk movies.