5 A collaborative effort between General Motors, Du Pont, and Frigidaire to find safer refrigerant led Thomas Midgley Jr. to the discovery of Freon® in 1928, a type of chlorofluorocarbon ... in the ...

In 2015, scientists at NASA predicted that the Ozone Hole would be half closed by 2020. That hasn’t happened. Other ...

By the end of March, 40% of the ozone in the stratosphere had been destroyed ... phased out many ozone-depleting chemicals such as the chlorofluorocarbons (CFCs) that were once in widespread ...

It has progressively helped governments phase out the chlorofluorocarbons and the ... the main locations where air gets uplifted into the stratosphere. "Our aircraft samples show the path from ...

brought about by an increase in chlorofluorocarbon emissions since the 1980s. Although the hole has been mitigated in several regions, the growing presence of these metals in the stratosphere has ...