Antarctic Ozone Layer Soon to be Restored
In January 1989, the Montreal Protocol came in effect eventually signed by more than 160 nations, which included a timetable on which the production of several groups of halogenated hydrocarbons had to stop.
Chlorofluorocarbons (CFCs) were in 1974 recognized by Mario Molina and Sherry Rowland, chemists at the University of California, as harmful to the Earth's ozone layer, even though production of CFCs had started already in the 1920s. They were awarded with the Nobel Prize in Chemistry in 1995 due to their work.
The hole in the ozone layer over Antarctic covered at its worst an area bigger than Canada 45 years ago. The depletion varies over the seasons, but accelerate when the sunlight comes back after the winter.
Argument: According to the study When will the Antarctic ozone hole recover, the ozone layer will in year 2068 be restored to the level it had 1980.
Please note: This article is an updated version based on new research. You find the old article if you click here.