The Columbian Exchange

The Columbian Exchange

Author: BBC Radio 4 March 26, 2026 Duration: 52:40

Misha Glenny and guests discuss the exchange of cultures and biology across the Atlantic and Pacific after 1492. That was when Columbus reached the Bahamas, a time when Europe had no potatoes, tomatoes, sunflowers or, arguably, syphilis in its most virulent form; the Americas had no cattle, bananas, sugar cane or smallpox. The lists of what was then exchanged are long and as these flora, fauna and diseases moved between continents, their impact ranged from transformation to devastation. In parts of the Americas, European viruses helped kill over 90 percent of the population. In parts of Europe, Africa and Asia populations boomed on the new American foods. Sheep from Europe grazed fertile land into deserts in some parts of the Americas, while the lowered populations in others led to local reforestation which, arguably, is linked to a particularly cold period in the Little Ice Age.

With

Rebecca Earle Professor of History at the University of Warwick

John Lindo Associate Professor of Anthropology at Emory University

And

Mark Maslin Professor of Earth System Science at University College London

Producer: Simon Tillotson

Reading list

Steven R. Brechin and Seungyun Lee (ed.), Routledge Handbook of Climate Change and Society (Routledge, 2024), especially the chapter ‘Human Impacts on the Climate Prior to the Industrial Revolution’ by Alexander Koch, Simon Lewis, Chris Brierley and Mark Maslin

Judith Carney and Richard Rosomoff, In the Shadow of Slavery: Africa’s Botanical Legacy in the Atlantic World (University of California Press, 2009)

EJ Collen, AS Johar, JC Teixeira and B. Llamas, ‘The Immunogenetic Impact of European Colonization in the Americas’ (Front Genet, August 2022)

Alfred W. Crosby, The Columbian Exchange: Biological and Cultural Consequences of 1492 (Greenwood Press, 1972)

Rebecca Earle, ‘‘‘If You Eat Their Food . . .”: Diets and Bodies in Early Colonial Spanish America’ (American Historical Review 115:3, 2010)

Raymond Grew (ed.), Food in Global History (Routledge, 1999), especially ‘The Impact of New World Food Crops on the Diet and Economy of China and India, 1600-1900’ by Sucheta Mazumda

Simon L. Lewis and Mark A. Maslin, The Human Planet: How We Created the Anthropocene (Pelican, 2018)

Nathan Nunn and Nancy Qian, ‘The Columbian Exchange: A History of Disease, Food, and Ideas’ (Journal of Economic Perspectives 24:2, 2010)

Jeffrey Pilcher (ed.), The Oxford Handbook of Food History (Oxford University Press, 2012), especially ‘The Columbian Exchange’ by Rebecca Earle

In Our Time is a BBC Studios production

Spanning history, religion, culture, science and philosophy, In Our Time from BBC Radio 4 is essential listening for the intellectually curious. In each episode, host Misha Glenny and expert guests explore the characters, events and discoveries that have shaped our world.


For anyone with a restless mind, the weekly In Our Time podcast from BBC Radio 4 offers a deep and engaging conversation across the vast terrain of human thought and experience. Host Misha Glenny guides a panel of distinguished academics, not in lecture format, but through a lively, accessible discussion where ideas genuinely collide and unfold. You might find yourself immersed in the complex legacy of a figure like Napoleon one week, and the next be untangling the scientific principles of photosynthesis or the philosophical arguments of the Enlightenment. The scope is deliberately broad, covering history, religion, culture, science, and philosophy, because understanding one often requires context from another. What you hear is the genuine process of exploration-the questions, the debates, and the connections made in real time by leading experts. It’s the kind of podcast that doesn’t just recount the Sack of Rome or the intricacies of Russian court politics, but examines why these moments mattered and how their echoes are still felt. The result is a consistently stimulating hour that treats listeners as curious equals, offering the intellectual satisfaction of following a great conversation to its illuminating conclusion.
Author: Language: English Episodes: 100

In Our Time
Podcast Episodes
The Battle of Clontarf [not-audio_url] [/not-audio_url]

Duration: 51:40
Melvyn Bragg and guests discuss one of the best known events and figures in Irish history. In 1014 Brian Boru, High King of Ireland, defeated the Hiberno-Norse forces of Sigtrygg Silkbeard and allies near their Dublin st…
The Gracchi [not-audio_url] [/not-audio_url]

Duration: 49:09
Melvyn Bragg and guests discuss the brothers Tiberius and Gaius Gracchus whose names are entwined with the end of Rome's Republic and the rise of the Roman Emperors. As tribunes, they brought popular reforms to the Roman…
Maurice Merleau-Ponty [not-audio_url] [/not-audio_url]

Duration: 59:02
Melvyn Bragg and guests discuss the French philosopher Maurice Merleau-Ponty (1908-1961), who was part of the movement known as phenomenology. While less well-known than his contemporaries Jean-Paul Sartre and Simone de…
Thomas Middleton [not-audio_url] [/not-audio_url]

Duration: 56:29
Melvyn Bragg and guests discuss one of the most energetic, varied and innovative playwrights of his time. Thomas Middleton (1580-1627) worked across the London stages both alone and with others from Dekker and Rowley to…
Cyrus the Great [not-audio_url] [/not-audio_url]

Duration: 50:59
Melvyn Bragg and guests explore the history and reputation of the Persian ruler Cyrus the Great. Cyrus the Second of Persia as he was known then was born in the sixth century BCE in Persis which is now in Iran. He was th…
Pollination [not-audio_url] [/not-audio_url]

Duration: 50:10
Since plants have to mate and produce offspring while rooted to the spot, they have to be pollinated – by wind, water, or animals – most commonly insects. They use a surprising array of tricks to attract pollinators: str…
Kali [not-audio_url] [/not-audio_url]

Duration: 57:41
Melvyn Bragg and guests discuss the Hindu goddess Kali, often depicted as dark blue, fierce, defiant, revelling in her power, and holding in her four or more arms a curved sword and a severed head with a cup underneath t…
Oliver Goldsmith [not-audio_url] [/not-audio_url]

Duration: 54:23
Melvyn Bragg and guests discuss the renowned and versatile Irish writer Oliver Goldsmith (1728 - 1774). There is a memorial to him in Westminster Abbey’s Poet’s Corner written by Dr Johnson, celebrating Goldsmith's life…
Catherine of Aragon [not-audio_url] [/not-audio_url]

Duration: 52:38
Melvyn Bragg and guests discuss Catherine of Aragon (1485-1536), the youngest child of the newly dominant Spanish rulers Ferdinand and Isabella. When she was 3, her parents contracted her to marry Arthur, Prince of Wales…
Sir John Soane [not-audio_url] [/not-audio_url]

Duration: 53:25
Melvyn Bragg and guests discuss the architect Sir John Soane (1753 -1837), the son of a bricklayer. He rose up the ranks of his profession as an architect to see many of his designs realised to great acclaim, particularl…