Where can I watch a movie about the climate crisis?

I'm not sure exactly which film you're talking about, but usually those documentary climate projects show at "Oktyabr" or "Dom Kino" in Moscow. Try searching through Yandex.Afisha or 2do.kino - you can see what's playing now and where, or you could just call the cinemas and ask. It might help if you write down at least roughly when the film came out or who directed it

I used to catch documentary films about ecology through the Kinopoisk app - they often show which streaming services have each film available, even if it's not playing in theaters anymore. If a movie came out last year, chances are it's already moved online, so it makes sense to search there right away instead of going around Moscow cinemas.

Several documentary films about climate came out over the past year, so it's hard to guess which specific one you mean without a title. Kinopoisk is really convenient - they have filters by genre and year, plus you can see where the film is available right now. But if you want to see it in a theater specifically, check the listings for Oktyabr and Dom Kino - they actually show documentaries pretty often; plus look at the websites of art cinemas like Proletariy or Sinema - they sometimes have special screenings of environmental projects. If you can remember any details from the film (like the main person featured or a specific country), it'll be easier to search.