What would have happened to the ozone layer if chlorofluorocarbons (CFCs) had not been regulated in the 1986 Montreal Protocol ?
This NASA Goddard model runs from the year 1974 to 2064 and compares projected concentrations of ozone based on current emissions (left sphere), with the scenario we avoided if these emissions hadn't been reduced (right).
Video: NASA/Goddard Space Flight Center Scientific Visualization Studio.
Music: 'Restart' by digitalR3public . Licensed under a Creative Commons Licence. CC BY 3.0