As severe weather events around the world give us a very real taste of the devastating effects of climate change, we’re also getting a better understanding of what the future holds for our planet. The Intergovernmental Panel on Climate Change releases its big report on the physical basis of climate change next week - the team previews what’s to come. They also explain why a number of nations are now mixing and matching their vaccine doses in order to stop the spread of the covid-19 delta variant. For the first time, microplastics have been found in human placentas, and the team examines the possible health implications. They also learn about new technology which is being used to send hidden messages in the calls of whales and dolphins, and they get all Doctor Who when they find out about the existence of real life time crystals. On the pod are Rowan Hooper, Penny Sarchet and Matt Sparkes. To read about these stories and much more, subscribe at newscientist.com/podcasts. Our GDPR privacy policy was updated on August 8, 2022. Visit acast.com/privacy for more information.