At the time it was signed, the Montreal Protocol was seen as a good thing for the planet. A new study shows it was even better than anyone first realized. Photo by Naeblys/Alamy Stock Photo

With the Montreal Protocol, life on Earth dodged a bullet we didn’t even know was headed our way.

by  J. Besl  

J. Besl is a writer in Anchorage, Alaska, where he writes about environmental change and contributes research stories for local universities. He has a master’s degree in water security from the University of Saskatchewan.