The Montreal Protocol that banned ozone-depleting chemicals excepted carbon tetrachloride and other chemicals used as feedstocks for production of other substances, assuming that their usage would stay low and decline. However, atmospheric concentrations of these feedstocks are increasing, delaying recovery of the ozone hole.

Summary: https://www.sciencedaily.com/releases/2026/04/260416071945.htm

Original paper: https://www.nature.com/articles/s41467-026-70533-w

#Science #Ozone #MontrealProtocol

Why we gave up #hairspray!

The #ozone layer above the Arctic has thickened https://www.thebarentsobserver.com/news/the-ozone-layer-above-the-arctic-has-thickened/437130

#climateaction #environment #globalwarming #MontrealProtocol #ParisAgreement

Today is a good day. Today is the birthday of the Montréal Protocol.

Adopted on September 16, 1987, and ratified by every UN-member state, this landmark treaty stands as the shining example of what humans can achieve when science, diplomacy, and collective action unite for our common good.

A mere 10-15 years after researchers had come to a consensus that chlorofluorocarbons (CFCs) were the cause of an expanding hole in the #ozone layer, international diplomacy defeated corporate interests in a battle for our future.

CFC emissions were reduced and eventually banned. The result of the Protocol is an ozone layer hole recovering, no longer expanding.

But aside from the tangible outcome, this day is about what the Montréal Protocol represents: facing uncomfortable truths, recognising the urgency, setting selfish interests aside in the pursuit of shared interests.

It’s #solidarity. We did it once, we can do it again.

Enjoy your #MontrealProtocol day, everyone.

@coleens_ lets just say the #MontrealProtocol was successful because the #decisionmakers of it's time would've felt the alternative within very few years and in their #lifetime.

• Unlike say #ClimateChange which the global #gerontocracy won't live long enough to suffer under!

Proof that #EnvironmentalPolicy works: "During the peak of #ozone depletion season, the 2024 area of the #OzoneHole ranked the seventh smallest since recovery began in 1992, when the #MontrealProtocol, a landmark international agreement to phase out ozone-depleting chemicals, began to take effect."

https://www.earthobservatory.nasa.gov/images/153523/ozone-hole-continues-healing-in-2024

#Environment

Ozone Hole Continues Healing in 2024 https://earthobservatory.nasa.gov/images/153523/ozone-hole-continues-healing-in-2024

"During the peak of #ozone depletion season from September 7 through October 13, the 2024 area of the ozone hole ranked the seventh smallest since recovery began in 1992, when the #MontrealProtocol, a landmark international agreement to phase out ozone-depleting chemicals, began to take effect"

"We need to initiate discussions as soon as possible. With space debris, it took us 20 or 30 years to define a solution. With [the satellite air pollution] problem, if we move on the same kind of timescale, it might be too late."

https://www.space.com/montreal-protocol-satellites-air-pollution

#Satellites #Space #Geoengineering #MontrealProtocol #Environment #SpaceSustainability #Aerosols