NASA discovers a mysterious source is still wrecking the ozone layer

New research by NASA found that a compound from an unknown source is destroying the ozone layer.

The compound — carbon tetrachloride — has been banned globally, and NASA doesn't know where it's coming from. Carbon tetrachloride used to be found in fire extinguishers and dry-cleaning products, but it was phased out under the Montreal Protocol in 1987.

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Meghan DeMaria

Meghan DeMaria is a staff writer at TheWeek.com. She has previously worked for USA Today and Marie Claire.