Source - NASA Science News for September 5, 2014
Almost 30 years after the Montreal Protocol put the brakes on ozone-depleting chemicals, one compound remains stubbornly and mysteriously abundant in the atmosphere. NASA scientists are tracking down the source and studying its effect on the ozone layer.
The complete article can be found here: http://science.nasa.gov/
A companion video is posted below and can also be viewed at: http://youtu.be/rq9EAHyHtu8
License: Standard YouTube License