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The history of glass-making dates back to at least 3,600 years ago in Mesopotamia, and both manufactured and naturally-occurring glass have been used in a wide variety of objects across the world. The curator and director of the Stained Glass Museum in Ely, Jasmine Allen, looks back at its long and varied history, highlighting its practical and artistic qualities. In the last century or so its industrial heartlands in Britain have been in the Black Country and the north east of England. John Parker, Professor of Glass Science at the University of Sheffield and curator of the Turner Museum of Glass, is an expert on the history of glass in this region, and the impact of mechanisation at the end of the 1800s.A new exhibition, The Glass Heart, at Two Temple Place in London (until 21st April) showcases industrial glass making as well as contemporary artworks. The artist and glassblower Ayako Tani finds inspiration in traditional calligraphy for her glass art, as well as the more recent development of glass ships in bottles from the 1970s.Glass can be moulded into all shapes and sizes and developed with different strengths, but the materials scientist Professor Claire Corkhill from the University of Bristol says it’s still quite a difficult and mysterious material. Her research is looking into innovative ways to use glass, and exploring whether it could even be the answer to the growing dilemma of managing Britain’s radioactive waste.Producer: Katy Hickman

The legal framework to prosecute war crimes and prohibit the use of ‘aggressive war’ came out of the international war crimes tribunals after WWII – in Germany and Japan. In Judgement at Tokyo the academic and writer Gary J. Bass retells the dramatic courtroom battles as Japan’s militaristic leaders were held accountable for their crimes. With prosecutors and judges drawn from eleven different Allied countries tensions flared, and justice in the Asia Pacific played out amidst the start of the Cold War, China's descent into civil war, and the end of the European empires.The political philosopher Hannah Arendt witnessed the end of the trial of the Nazi Adolf Eichmann in Jerusalem in 1963, coining the phrase ‘the banality of evil’ – a term that is often mistakenly believed to mean that evil had become ordinary. In We Are Free To Change The World, the writer Lyndsey Stonebridge explores Arendt’s writings on power and terror, love and justice, and their relevance in today’s uncertain times.As the world grows increasingly turbulent war crimes justice is needed more than ever, but it appears to be failing. Since the International Criminal Court in the Netherlands opened in 2002 it has jailed just five war criminals. The journalist and war reporter Chris Stephen looks back at its history and examines alternative options in The Future of War Crimes Justice.Producer: Katy Hickman

The data analyst Hannah Ritchie challenges the doomsday climate scenarios dominating the headlines to argue for a more hopeful outlook. In Not the End of the World: How We Can Be the First Generation to Build a Sustainable Planet she uses the data to show what progress has been made, and what actions will have the most impact in the future.Capitalism, consumerism and unfettered growth are often blamed for the climate crisis, but the Bloomberg journalist Akshat Rathi believes that capitalism is the best means we have to tackle the issues in time. In Climate Capitalism he meets the business people and politicians from around the world who are finding innovative ways to go green.The oceanographer and Joint Director of the UK National Climate Science Partnership, Professor Michael Meredith often works in one of the most difficult and least understood areas of the planet - the Southern Ocean around the Antarctic. He believes that while individual actions and choices are important to tackle climate change, only stronger worldwide governance can slow the irreversible effects of ice sheet decline and rising sea levels.Correction: during the live broadcast we mistakenly stated that Britain gets more than 40% of its energy from renewables, instead of 40% of its electricity.Producer: Katy Hickman