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Scoop.it!
Visit http://science.nasa.gov/ for more. Almost 30 years after the Montreal Protocol put the brakes on ozone-depleting chemicals, one compound remains stubbo... 
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Scoop.it!
Mysterious compounds undermining recovery of giant ozone hole over Antarctica, scientists warn
PIRatE Lab's insight:
Quite disappointing.
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Things are much better in the stratospheric ozone word now thanks to one of the most successful environmental treaties in history: the Montreal Protocol. But while the ozone thinning has been becoming less of a challenge in recent years as the atmospheric system heals from the onslaught on ozone-depleting chemicals, one compound persists. CCl4 is lingering longer than we thought.
Behind only the most nasty of the CFCs, CCl4 is the 3rd most destructive anthropogenic compounds we created post-WWII. This is still a massive success story, but it highlights that these atmospheric systems are quite complex.