It’s no longer necessary to watch post-apocalyptic movies since we are living in the middle of the apocalypse now. The apocalypse: all fiction, all faith. But it’s happening right now. Here astrobiologist David Grinspoon breaks down apocalyptic scenes from movies, including ‘I Am Legend,’ ‘Interstellar,’ ‘WALL-E,’ ‘The Day After,’ ‘Ad Astra,’ ‘Waterworld,’ ’12 Monkeys,’ ‘The…