In 1985, the British Antarctic Survey discovered something that shocked scientists around the world: the ozone layer had a hole in it. And the hole was growing very quickly.

When they were presented with the problem, politicians and world leaders quickly came up with an international agreement to immediately reduce chlorofluorocarbons released into the atmosphere. It was a success story, and we can learn from it on climate change.

In the episode:

Atmospheric chemist Dr. Susan Solomon shares her story of leading a team of scientists to Antarctica, scrambling to understand the problem and pretty quickly finding the root cause: a group of chemicals called chlorofluorocarbons that people were releasing into the atmosphere on the other side of the planet.

NASA chemist Dr. Anne Douglass explains ozone and and the very serious consequences of living in a world without an ozone layer. She also compares the decisive Montreal Protocol to the very different modern reaction to climate change, where American politicians openly deny the science at the root of a global crisis.