From climate change and plastic pollution, to mining and overfishing, the threats facing our oceans are getting more urgent every day. The oceans produce half of our oxygen, and food for a billion people. And because they soak up huge amounts of carbon dioxide, they’re also one of our best defences against climate change. Our fate is bound to the fate of our oceans. If they don’t make it, we don’t either. Now though, there’s a ray of hope. There’s a new treaty in the works that could pave the way for new ocean sanctuaries all over the world.