A Mysterious Force Is Causing A Rise In Ozone-Destroying Emissions
CFC-11 is an ozone-depleting chemical that's been under an international ban since 2010.
But there's been a surprising increase of the chemical in the ozone by 25 percent since 2012.
Almost no CFC-11 has been been produced since 2006, or so it was thought.
Researchers suspect the spike in the chemical is coming from somewhere in eastern Asia.
The ultimate impact on the ozone depends on how quickly the culprit is found and stopped.