Trees have the remarkable ability to pass knowledge down to succeeding generations and to survive the ravages of climate change, if only we’d let them alone, according to the German forester Peter Wohlleben. In The Power of Trees (translated by Jane Billinghurst) he explains the significance of leaving ancient forests untouched, and is scathing about the failures in forestry management and the planting of non-native trees for profit. Jill Butler is an ancient tree specialist and a trustee of the Tree Register of the British Isle which records the nation’s ‘champion trees’ – the tallest and biggest trees of their species. But she’s also keen on getting the public involved in helping to find and care for some of the country’s oldest trees with the citizen science project, Ancient Tree Inventory, run by the Woodland Trust. The healing powers of ancient trees is celebrated in stories throughout history, including the great Icelandic sagas. In The Norse Myths That Shape the Way We Think Carolyne Larrington, Professor of medieval European Literature explores the renewal that comes from the roots of Yggdrasill, the World Tree. Producer: Katy Hickman

Why is it so difficult to find a place to call home? By the age of twenty five the journalist Kieran Yates had lived in twenty different houses, from council estates in London to a car showroom in rural Wales. In All The Houses I’ve Ever Lived In she reveals the reality of Britain’s housing crisis, the state’s neglect, and the toll it takes on those forced to move from place to place. In her memoir Undercurrent the writer and poet Natasha Carthew compares the picture-postcard view of her native Cornwall with the reality of growing up there. She explores the impact of rural poverty, political neglect, and the dominance of second-home owners, but also the sheer beauty of the landscape she calls home. Christine Whitehead OBE is a specialist in housing economics and evaluates government policies on home ownership and housing supply. She looks at the unintended consequences of implementing policies, like rent caps and controls on buying housing stock in rural areas, and the impact of Covid on the rental market. The architect Alice Brownfield, Director at Peter Barber Architects, advocates for high density, mixed-use residential schemes for local councils and housing associations. Her practice has been recognised for its work in developing social housing, often on small plots of land, that centres on fostering a sense of community. Producer: Katy Hickman Image: Kiln Place, by Peter Barber Architects just after completion. Image credit: Morley von Sternberg

The artist Ai Weiwei has always enjoyed ignoring the boundaries between disciplines, fusing art, architecture, design, collecting and social activism. He’s now taken over the Design Museum in London (from 7th April – 30th July 2023), filling it with his work and collections - from millions of handcrafted porcelain sunflower seeds to Lego pieces and broken teapot spouts dating back to the Song Dynasty. The exhibition, Making Sense, explores what we value - from what we perceive to be precious or worthless, to the tensions between the past and present, as well as work made by hand and machine. The engineer Roma Agrawal invites readers to marvel at the design of many of the small but perfectly formed inventions that have changed the world. In Nuts & Bolts she deconstructs complex feats of engineering to focus on the nail, spring, wheel, lens, magnet, string and pump. The economist Bent Flyvbjerg is also interested in deconstructing things, but he's focused on ambitious multi-million pound projects to find out why the vast majority are significantly over-budget and past their deadline. In How Big Things Get Done he extolls the virtue of 'thinking slow, acting fast', and how megaprojects that are designed with Lego-building in mind are more likely to succeed. Producer: Katy Hickman Image credit: close up of Monet's Water Lilies in Lego, constructed by Ai Wei Wei - photo copyright by Ela Bialkowska OKNO Studio

How do people learn new skills and become real experts? These were the questions the author Adam Gopnik wanted to answer in his new book, The Real Work – a term magicians use for their accumulated craft. He apprenticed himself to an artist, a dancer, a boxer, and even a driving instructor to see if could get to the bottom of the mystery of mastery, and better himself. Rebecca Struthers is a true master of her profession – horology. In Hands of Time, A Watchmaker's History of Time she reveals the inner cogs and workings of clocks, and explores the ways in which they have helped shape human history. But she also regrets the endangered art of traditional watchmaking and the loss of heritage skills. The neuroscientist Hannah Critchlow explains what’s happening in our brains when we learn new things, especially later in life. And she argues that two heads may be better than one. In her latest book, Joined Up Thinking, she extols the virtues of working and learning together. Producer: Katy Hickman Image Credit: Rebecca Struthers for Hands of Time

The world is now warming faster than at any point in recorded history. Kirsty Wark talks to an historian, scientist and novelist about how to convey the story and impact of climate change. Floods, droughts, volcanic eruptions, hurricanes and solar activity have all shaped the natural history of our world from its formation. In The Earth Transformed the historian Peter Frankopan looks back at how the climate has constantly changed our world, but also at the impact of extreme climatic events on ancient human civilisations – often violent and epic in scale, from regime change to demographic decline. However, since the Industrial Revolution the balance has shifted and anthropogenic impacts on the climate can be seen more clearly. Peter Frankopan tells Kirsty Wark that learning lessons from the past has never been more important in tackling a precarious future. Professor Dame Jane Francis is Director of the British Antarctic Survey. As a geologist by training, she studies fossils to understand the change from greenhouse to icehouse climates in the polar regions over the past 100 million years. Her research enables others to map the huge changes now happening in the Antarctic and the range of possible scenarios for the future. “As I grew up, crisis slid from distant threat to imminent probability, and we tuned it out like static, we adjusted to each emergent normality, and did what we had always done. . . .” One of the narrators of Jessie Greengrass’s novel The High House realises too late the disastrous impact of climate change. In what has become known as the literary genre clifi – climate fiction – Greengrass reveals the physical and emotional challenges the survivors face. Producer: Katy Hickman Image: An iceberg in Antarctica

The writer Sarah Bakewell explores the long tradition of humanist thought in her latest book, Humanly Possible. She celebrates the writers, thinkers, artists and scientists over the last 700 years who have placed humanity at the centre, while defying the forces of religion, fanatics, mystics and tyrants. But placing humans at the centre isn’t without problems – critics point to its anthropocentric nature and excessive rationalism and individualism, as well its Euro-centric history. The philosopher Julian Baggini guides the listener in unpicking the tenets of humanism. His latest books is How to Think Like a Philosopher: Essential Principles for Clearer Thinking. Humanism may have relegated the divine to the side lines, but for the characters in Leila Aboulela’s novels faith and devotion are integral to their sense of themselves. In her latest book, River Spirit, set in Sudan in the 1880s, her young protagonists struggle to survive and find love amidst the bloody struggle for Sudan itself. Producer: Katy Hickman

George Eliot was a leading novelist who scandalised Victorian society by eloping to Germany with a married man and living in unlawful conjugal bliss. She dedicated her books to ‘her husband’ and wrote of 'this double life, which helps me to feel and think with double strength'. The philosopher and writer Clare Carlisle has written a new biography of George Eliot which places The Marriage Question at the centre of her art and life. The playwright David Eldridge is writing a trilogy of plays about relationships. Beginning, which premiered in 2017, and Middle, from last year, take place overnight in one uninterrupted scene as the couples share their thoughts and feelings on love and loneliness. The final play will be called End. The prize winning poet Claudia Rankine talks about her collection Plot, published in full for the first time in the UK. In a series of conversations, reflections and dreams Rankine reveals the hopes and fears of Liv and Erland – a couple navigating the birth of their new baby. Producer: Katy Hickman

It’s twenty years since the US and UK invaded Iraq to overthrow Saddam Hussein. Kirsty Wark discusses the lead up to the war, the impact on the lives of Iraqis and the legacy. Ghaith Abdul-Ahad left his job in Baghdad and became a journalist during the Iraq War in 2003. He witnessed first-hand the liberation of his country from a megalomaniac leader and then its descent into factionalism and violence. In A Stranger In Your Own City he movingly recounts the very real human cost of the invasion, as well as the civil wars and rise of ISIS that followed. Emma Sky volunteered to help rebuild Iraq post-invasion and went on to serve as the representative of the Coalition Provisional Authority in Kirkuk and then as a political advisor to the US army in the following decade. Now an academic at Yale University, she looks back at why the Iraq invasion failed and its implications across the region. She's the author of The Unravelling and In a Time of Monsters: Travelling in a Middle East in Revolt. The BBC’s Security correspondent Gordon Corera was a young reporter during the frenetic build up to the war, talking to spies, defectors and politicians. In a 10-part series – Shock and War: Iraq 20 Years On (from 13th March at 1.45 and on BBC Sounds) – he talks to those at the centre of that decision to go to war, and looks at the far-reaching consequences, from trust in politics, security and liberal intervention. Producer: Katy Hickman

It’s Ok To Be Angry About Capitalism is the title of the new book by the US politician Bernie Sanders. In it he castigates a system that he argues is fuelled by uncontrolled greed and rigged against ordinary people. He tells Tom Sutcliffe it’s time to reject an economic order and a political system that continues to benefit the super-rich, and fight for a democracy that recognises that economic rights are human rights. The Chief Economics Commentator at the Financial Times Martin Wolf looks more closely at how and why the relationship between capitalism and democracy appears to be unravelling. But despite the failings – slowing growth, growing inequality and widespread popular disillusion – he argues in The Crisis of Democratic Capitalism that the relationship remains the best system for human flourishing. But the economist Kate Raworth believes that mainstream economics has had its day. Its failure to predict and prevent financial crises, while allowing extreme poverty, inequality and environment degradation to persist, means its contributing to, not solving, societal unrest. She argues that her theory – Doughnut Economics – offers a new model for a green, fair and thriving global economy. Producer: Katy Hickman

The theoretical physicist Carlo Rovelli celebrates the life of an ancient Greek philosopher, in Anaximander And The Nature Of Science (translated by Marion Lignana Rosenberg). He tells Adam Rutherford that this little known figure spearheaded the first great scientific revolution and understood that progress is made by the endless search for knowledge. Anaximander challenged conventions by proposing that the Earth floats in space, animals evolve and storms are natural, not supernatural. The travel writer Kapka Kassabova has gone searching for ancient knowledge about the natural world in her latest book, Elixir: In the Valley at the End of Time. The Mesta River, in her native Bulgaria, is one of the oldest inhabited rivers in Europe, and a mecca for wild plant gatherers, healers and mystics. In Dvořák’s lyric opera the eponymous hero Rusalka is a water spirit who sacrifices her voice and leaves her home for the love of a Prince. In a new contemporary staging at the Royal Opera House (21 February–7 March 2023) the co-directors Ann Yee and Natalie Abrahami foreground the uneasy relationship between nature and humanity, and the latter's destruction of what it fails to heed. Producer: Katy Hickman Image credit: Asmik Grigorian in Natalie Abrahami and Ann Yee’s Rusalka, The Royal Opera ©2023 Laura Stevens