Do we understand the urgency of the global biodiversity and climate change crisis? Stephen Sackur speaks to the director of the Royal Botanic Gardens at Kew, Richard Deverell. Kew Gardens in London is a UNESCO world heritage site and home to one of the largest collections of living plants in the world and an unrivalled repository of preserved specimen plants collected by scientific pioneers such as Charles Darwin. Richard Deverell has big ambitions to put Kew at the centre of the fight to avert environmental catastrophe by helping the public to grasp the scale of the challenges caused by biodiversity loss and a warming planet.

From Covid to climate change, governments around the world face challenges which demand modifications of human behaviour. When it comes to getting people to do things differently, what works best: the carrot of persuasion, or the stick of coercion? Stephen Sackur speaks to Richard Thaler, the world renowned economist and behavioural scientist who believes a nudge often works better than a shove when change is needed. Does that hold good when the problems we face become urgent and existential?

Seventy-five years after the Nuremberg Military Tribunals convicted some of the most senior Nazis of war crimes and crimes against humanity, the last surviving prosecutor from the trials, Ben Ferencz talks to Zeinab Badawi. Does he believe the Nuremberg trials have made genocide and crimes against humanity less likely to be committed in the world today? This programme was first broadcast in 2017.

(Photo: Ben Ferencz Hardtalk interview in 2017))

The crisis over a lack of supplies in the UK triggered by a shortage of truck drivers has reignited the debate about the consequences of Brexit. This comes on top of concerns about the impact on trade between Great Britain and Northern Ireland and what it means for the historic peace agreement there. Zeinab Badawi speaks to Michel Barnier, who was the EU’s chief Brexit negotiator and has declared himself a centre-right candidate for the presidential elections in France next year. How does he see the fallout from Brexit and why does he think he’s fit to be the next president of France?

(Photo: Michel Barnier in the Hardtalk studio)

Zeinab Badawi speaks to Rafael Grossi, Director General of the International Atomic Energy Agency, amid concern about renewed tensions over Iran’s nuclear programme. Tehran insists that it is only developing nuclear power for civilian purposes but now Israel has warned that it crosses all “red lines” and that it won’t allow Iran to acquire nuclear weapons. This follows warnings by Washington and the EU that Iran must allow international weapons inspectors full access to its workshops. Has the IAEA’s inspection programme failed and dashed all hopes of a diplomatic solution to this crisis?

(Photo: Rafael Grossi appears via video link on Hardtalk)

Stephen Sackur speaks to renowned British Indian musician and composer Nitin Sawhney. From a childhood disfigured by racism to the embrace of the UK’s cultural elite, what are the common threads in his remarkable career?

Stephen Sackur speaks to one of the world's most celebrated cinematographers, Roger Deakins. He has won Oscars for his work on 1917 and Blade Runner 2049, and also shaped the look of modern classics such as O Brother, Where Art Thou?, Skyfall, The Big Lebowski and The Shawshank Redemption. But is technology, from CGI to the ubiquitous camera phone, changing everything we thought we knew about making films?

Republicans in Texas have managed to ban abortion in almost all cases in their state. Anyone performing, aiding or abetting the termination of a pregnancy after roughly six weeks can be sued in court. The implications are enormous, not just in Texas but across the US. And it points to a wider phenomenon. Ideological conservatives are using state activism to confront federal power. Stephen Sackur spoke to Texas Republican State Senator Bryan Hughes just hours before the first law suit was filed against a doctor under the new law.

Stephen Sackur speaks to Nicaraguan journalist and former revolutionary Carlos Fernando Chamorro. He is currently in exile as President Daniel Ortega intensifies his crackdown on dissent. Why has the country slumped back into authoritarianism?

In an exclusive interview for the BBC’s 100 Women season, Zeinab Badawi speaks to supermodel Naomi Campbell.

(Photo: Naomi Campbell smiles at Zeinab Badawi)