False-color image of ozone concentrations above Antarctica on Oct. 2, 2015.
NASA/Goddard Space Flight Center
Earth's ozone layer shields us from harmful ultraviolet radiation. Nations have been working to reduce ozone-depleting chemicals since the 1980s, but recent studies show that there is still work to do.
There is an environmentally friendly option.
As if having asthma wasn't bad enough news, your health condition is probably contributing to climate change.
Sunrise over the Earth. Hydrofluorocarbons were created to protect the ozone layer, but their stable nature makes them an extremely potent greenhouse gas.
Australia has ratified an agreement to phase out hydrofluorocarbons, a manmade compound once hailed as the saviour of the ozone layer. What went wrong?
A wide range of industrial processes have released greenhouse gases into the atmosphere.
While the gases most responsible for global warming - carbon dioxide, methane and nitrous oxide - continue to climb, other industrial greenhouse gases are being brought gradually under control.