Barack Obama attends COP26

Former US president Barack Obama has been speaking at the UN climate summit in Glasgow. Jessica Shankleman of Bloomberg tells us about the debate ongoing at COP26 today about how much rich nations should give poorer nations to switch to green energy systems, and adapt to climate change. And Gajen Kandiah, chief executive of Hitachi Vantara, discusses the role that artificial intelligence may be able to play in preventing deforestation. Also in the programme, voters in a Twitter poll initiated by Elon Musk, chief executive of Tesla Motors, have urged him to sell 10% of his stake in the company in order to pay tax. Bob Lord is a tax lawyer and associate fellow at the Institute for Policy Studies, and explains the implications of such a move.