the depletion continues
TBH I've only scanned the wiki page en.wikipedia.org/wiki/Ozone_depletion but as I understand it CFCs have been reduced but the ones put out in the past are still causing significant damage. A CFC molecule can stay in the atmosphere for about 100 years.

There's some predictions saying that the problem will bottom out and it'll improve again. But we're not on that upslope, or even that bottom. We're still going down the hill. I repeat. The depletion is getting worse.
( rob, Wed 7 Dec 2011, 14:58, 1 reply)

Apparently Concorde used to replenish the ozone layer...
Part of its exhaust gases comprised ozone, or something. I'm not sure why it was only Concorde, or why they didn't figure out how it did it and make all planes do the same thing.


/useless fact and rubbish idea
(Professor Kenny Martin Hmm? What?, Wed 7 Dec 2011, 15:50, closed)

"Concorde produced nitrogen oxides in its exhaust, which, despite complicated chemical interactions with other ozone-depleting chemicals, are understood to result in degradation to the ozone layer at the stratospheric altitudes it cruised.[177] It has been pointed out that other, lower-flying, airliners produce ozone during their flights in the troposphere, but vertical transit of gases between the layers is restricted. The small fleet operated meant overall ozone-layer degradation caused by Concorde was negligible"
(Quintno EXPERIMENT RUINED CANCELLED, LEFT 4EVER, Wed 7 Dec 2011, 19:53, closed)

You mean I've been believing a lie all this time?!

(Professor Kenny Martin Hmm? What?, Thu 8 Dec 2011, 9:23, closed)