We’ve heard an awful lot about climate change since Al Gore published his controversial film “An Inconvenient Truth” fifteen years ago, and it’s now broadly accepted as the great crisis of our time across the international community.

But you might not know that scientists were warning of the dangers global warming might cause as early as the 1950s.

Alice Bell is the author of Our Biggest Experiment: An Epic History of the Climate Crisis, and she joined Tom Dunne to tell the stories of the little-known scientists who sounded the alarm of the defining story of our age, and why their warnings weren’t heeded.