13th January
Stratospheric ozone depletion is one planetary boundary* where we did cross into the danger zone and through concerted global action, pulled back from into the safe limits of the boundary. Regulations curbing what chemicals could be used, for example, in fridges and aerosols, had a real effect!
“”In the face of a triple planetary crisis – climate, nature and pollution – the Montreal Protocol is one of the best examples we have that showcases the positive and powerful outcome of multilateralism,”
Meg Seki, Executive Secretary of UNEP’s Ozone Secretariat. (1)
(1) https://www.unep.org/news-and-stories/story/rebuilding-ozone-layer-how-world-came-together-ultimate-repair-job Do read this full article and/or watch the YouTube clip.
* NB What are the planetary boundaries? https://greentau.org/2025/10/22/counting-on-170/
The Green Tau 