Guest: Kate Allen is a Climate Change Reporter at the Star Chlorofluorocarbons, a.ka. CFCs, are chemicals that were used in all kinds of household items in the 70s and 80s, but they were found to be causing a massive hole in the Earth’s ozone layer. The world committed to act and their use was banned and replacements were found and the ozone layer is now healing. But new research shows that some CFCs are mysteriously rising. What does that mean and how will it affect the environment? This episode was produced by Brian Bradley, Paulo Marques and Raju Mudhar.