Paul Crutzen, Mario Molina and Sherwood Rowland were awarded the Nobel Prize in Chemistry in 1995 for helping us understand why the ozone layer, which protects us from harmful UV radiation, was disappearing. On this day, in 1987, nations signed the Montreal Protocol on Substances that Deplete the Ozone Layer in order to fix the problem. Thanks to the laureates work we have managed to reverse this depletion and today the ozone layer is starting to recover. GIF: Ozone depletion occurs in cold temp

5.4K views · 398 reactions | Happy birthday to Paul Crutzen who was awarded the Nobel Prize in Chemistry in 1955 for helping us understand why the ozone layer, which protects us from harmful UV radiation, was disappearing. GIF: Ozone depletion occurs in cold temperatures, so the ozone hole reaches its annual maximum in September or October, at the end of winter in the Southern Hemisphere. Credits: NASA/NASA Ozone Watch/Katy Mersmann | Nobel Prize | Facebook