Biosphere is a buddy comedy about the last two dudes on Earth Image: IFC FilmsIt’s always nice when the end of the world can have some levity. Biosphere, from director Mel Eslyn, manages to mash up a post-apocalyptic story with a buddy comedy for a movie about two best pals who just so happen to be the last remaining people on the planet. It’s a high concept told at a small scale, with the entirety of the …