Analysis

Will human actions result in the demise of huge numbers of other species - in a mass die-off, comparable to the end of the era of the dinosaurs? Neal Razzell assesses the evidence that species are dying off at a rapid rate, and looks at some of the surprising things we might do to slow or reverse this process. Producers: Beth Sagar-Fenton and Josephine Casserley

What is the chance of the human race surviving the 21st century? There are many dangers – climate change for example, or nuclear war, or a pandemic, or planet Earth being hit by a giant asteroid. Around the world a number of research centres have sprung up to investigate and mitigate what’s called existential risk. How precarious is our civilisation and can we all play a part in preventing global catastrophe? Contributors Anders Sandberg, Future of Humanity Institute. Phil Torres, Future of Life Institute. Karin Kuhlemann, University College London. Simon Beard, Centre for Existential Risk. Lalitha Sundaram, Centre for Existential Risk. Seth Baum, Global Catastrophic Risk Institute. Film clip: Armageddon, Touchstone Pictures (1998), Directed by Michael Bay. Presented (cheerily) by David Edmonds. Producer: Diane Richardson

Is there a better way to heal political divides - through panels of ordinary citizens? Sonia Sodha asks if the idea of citizens' assemblies, which have been used around the world to come up with solutions to polarising issues. Proponents argue that they avoid the risks of knee-jerk legislation, winner-takes-all outcomes or the pull of populism. Many in the Republic of Ireland believe that deliberative democracy was crucial in reforming the law on abortion without causing major political upheavals. Could this method still come up with a better way forward for Brexit? Producer: Maire Devine

Voters and politicians in Britain claim to be perplexed that economic and political relations between the UK and the Republic of Ireland seem to be decisive in determining the course of Brexit. They shouldn't be, argues Edward Stourton. A glance at the history of the countries' relations since the Acts of Union in 1800 helps to explain the situation. From at least the time of Catholic Emancipation in the 1820s, political, social, cultural and economic issues on the island of Ireland have influenced and shaped politics at Westminster. The point is that MPs and others at Westminster have seldom appreciated this and therefore underestimated the power of that history to affect the course of a contemporary issue like Brexit. Looking at a range of issues from Emancipation, the 1840s Irish potato famine, Catholic clerical education, the campaign for Home Rule leading ultimately to the War of Irish Independence in the twentieth century and the bloody establishment of the Irish Free State, as well as the Troubles and the Good Friday Agreement in 1998, Edward Stourton explores the way in which issues in Ireland have determined British politics. He considers especially what lessons these episodes may hold for today's Westminster politicians and how to imagine the Anglo-Irish future. Among those taking part: Lady Antonia Fraser, Professor The Lord Bew, Professor Sir David Cannadine, Professor Roy Foster, Professor Marianne Elliott, Fintan O'Toole and Declan Kiberd. Producer: Simon Coates

Does a falling currency help or harm the economy? It's an urgent question for the UK, as the pound fell sharply in value against other major currencies after the referendum on Britain’s membership of the European Union in June 2016. Market commentators put this down to foreign investors becoming intensely gloomy about the prospects for the UK economy after Brexit. Others have welcomed the drop, saying it will benefit British exporters. But is it really such a simple, binary question? Paul Johnson, director of the Institute for Fiscal Studies investigates. Contributors: Richard Barkey, CEO, Imparta Roger Bootle, chairman, Capital Economics Meredith Crowley, reader in international economics at Cambridge university Jane Foley, head of foreign exchange strategy, Rabobank Rain Newton-Smith, chief economist, Conferdation of British Industry Mick Ventola, managing director, Ventola Projects Producer: Neil Koenig