The Winterkeeper: a lifetime spent protecting Yellowstone National Park

Steven Fuller has spent fifty winters as the sole caretaker at Yellowstone, hunkering down in a remote cabin as the park empties out and the cold sets in. As the climate crisis threatens the wilderness he has watched over for half a century, the film sits with him in the quiet of a job almost nobody else does anymore.

Why it's free: Free on The Guardian's own channel; The Guardian made it.