Climate science and politics

As the COP27 environment summit draws to a close we look at some of the issues still to be resolved. BBC Environment correspondents Victoria Gill and Georgina Rannard join us from the meeting. And we head to the houses of parliament in the company of a group of teenagers who are putting their concerns over climate change to a panel of politicians. Julia Ravey went to meet them. We hear from author Nick Davidson about how the discoveries of 3 unlikely characters in the 19th century formed the basis of geological science. His book The Greywacke is shortlisted for the Royal Society Science Book Prize. And a scientific analysis of the Winchcombe meteorite gives us some clues as to the possible origins of life on earth. Natasha Stephen from Plymouth University is one of the many scientists who analysed the composition of the rock fragments.