World Ozone Day: Forest fires pose new threat to ozone layer
Study finds black carbon due to frequent, widespread wildfires may be widening the ozone hole
Human-led climate impact rapidly cooling upper atmosphere even as lower atmosphere warms
Study finds stratosphere temperatures 12 to 15 times greater than natural
Countries agreed to ban ozone-depleting chemicals in 1980s — but 5 CFCs are increasing to record levels in atmosphere
The 1987 Montreal protocol restricted the release of chlorofluorocarbons to the atmosphere