Throughline6 Nov 2025

Winter is Coming

Late last month, President Trump announced that the United States would be restarting nuclear weapons tests after a break of over 30 years. We’ve since learned that they won’t be the explosive kind of tests, but this sent us down a rabbit hole — where we found a story about dinosaurs, Carl Sagan, and nuclear war. Because there was a moment in the not-so-distant past when we learned what drove the dinosaurs extinct... and that discovery, made during the Cold War, may have helped save humans from the same fate. This episode originally published in March 2025.

Guests:

David Sepkoski, Thomas M. Siebel Chair in History of Science at the University of Illinois and author of Catastrophic Thinking: Extinction and the Value of Diversity.

Owen Brian Toon, professor of atmospheric and oceanic sciences at the University of Colorado Boulder.

Alec Nevala-Lee, novelist, critic, and biographer and author of the forthcoming book Collisions: A Physicist's Journey from Hiroshima to the Death of the Dinosaurs.

Ann Druyan, co-writer and co-creator of the television series Cosmos: A Personal Voyage.

Andrew Revkin, science and environmental journalist.

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