Neat News 1488 (added 2020-01-27)
Arctic warming slower because ozone hole closing

Public Domain by NASA
The 1987 Montreal protocol on substances that deplete the ozone layer was a mile stone in international cooperation to save the ozone layer. It is not only exemplary for how to combat climate change, but also made a significant contribution in slowing arctic warming, since the chemical that damages the ozone layer is also a potent greenhouse gase.