Ozone loss was a thing even before CFCs were widely used
Summary
The article discusses a MIT-led study suggesting that ozone depletion could have been detected earlier with modern tools. It explains that ozone loss began before widespread CFC use, with carbon tetrachloride also contributing; early detection would have allowed earlier intervention. The piece notes that satellites monitoring ozone are aging or nearing end of life, highlighting gaps in ongoing observation and the need for replacement or new systems.