So, now that I’ve thoroughly frightened us all with the terrifying visions of the apocalypse, I guess I should answer the question: what can we do to save ourselves? What should we do to save ourselves? Of course, this podcast episode won't save the world - not even close. But hopefully it will raise some interesting questions - and, if you agree or disagree with what I'm saying, as ever, please contact me! You can get in touch via Twitter @physicspod, the Facebook page at Physical Attraction, and through the contact form at www.physicspodcast.com Any comments, questions, or concerns would be greatly appreciated.  If you like what we do, there are many ways to support the show; at www.physicspodcast.com, you'll be able to donate to the show and buy extra episodes via Patreon or via paypal donations. You can leave a rating and review on your favourite iTunes app, which really helps us get noticed! And, finally and perhaps best of all, please tell your podcast-listening friends about the show.