Let’s add another. The Montreal Protocol, 1987. Global treaty to phase out ozone-depleting substances. Scientists noticed a literal hole in the sky. Governments listened. Industry adapted. Regulation worked. And the ozone layer began to heal. It was not perfect, and it was not immediate, but it stands alone in the climate policy world: a... See more

Let’s add another. The Montreal Protocol, 1987. Global treaty to phase out ozone-depleting substances. Scientists noticed a literal hole in the sky. Governments listened. Industry adapted. Regulation worked. And the ozone layer began to heal. It was not perfect, and it was not immediate, but it stands alone in the climate policy world: a... See more