All That Breathes is a documentary that can be described simply, but that would miss the point. It is about two brothers in New Delhi who rescue birds, black kites to be exact. On that level, it's an interesting and informative work. But it's about a lot more than just rescuing birds.
There is unrest, always in the distance, yet never seeming to be far away. The air is so polluted that birds fall from the sky. The ground doesn't seem much better ... early on, we see rats overrunning a area filled with, well, a little of everything. The trick Shaunak Sen uses is that none of this is foregrounded. Throughout the film, Sen focuses on the brothers, working out of their basement, searching for funding for a hospital, imagining a future outside of New Delhi. You are always aware of the unrest and the pollution and the ways everything is connected, because Sen never lets us forget, even while what we are seeing is primarily the brothers.
The film features some lovely cinematography, and we get to know the brothers, Nadeem Shehzad and Mohammad Saud, as the movie progresses. There is always something interesting going on, although much of it is depressing. The brothers know their work is a drop in the bucket, but they go on, for what else is there to do except try to better the circumstances of their environment.