2018
January
Public Domain by NASA
| In 1989 the Montreal Protocol came into effect in order to protect the ozone layer against cholor-flurocarbons (so-called CFCs) which were used in fridges. The amount of CFCs is slowly declining at a rate of 0.8% per year on average, however, there is a lot of year-to-year variability in this. Still the Montreal Protocol is working and the ozone destruction is decreasing. |