NASA finds unexpectedly high levels of banned ozone-depleting chemical

It’s been decades since the world realized the danger that chlorofluorocarbons (CFCs, formerly found in products like aerosol sprays, refrigerants, and solvents) posed to the Earth’s ozone layer. But despite the fact that the CFC known as carbon tetrachloride (CCl4) was banned way back in 1987, a new study from NASA shows a troubling amount of the compound in our atmosphere — something that presents a continued threat to the hole in the ozone layer over Antarctica.

“We are not supposed to be seeing this at all,” said NASA’s Qing Liang, lead author of the study. “It is now apparent there are either unidentified industrial leakages, large emissions from contaminated sites, or unknown CCl4 sources.” Between 2007 and 2012, studies showed…

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