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

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