The Montreal Protocol of 1987 called upon the world to control the production and use of ozone-depleting substances (ODS) in order to protect the ozone layer.
Nearly 30 years after the whole world joined forces to address the threat brought about by the thinning ozone layer, scientists at MIT confirm that the hole over Antarctica is starting to heal.
They found evidence that the September ozone hole has shrunken by over 4 million square kilometers since. The world’s efforts to reverse the damage are showing promising results, and that is despite some setbacks caused by sulfur dioxide from volcanic eruptions.
The team measured “fingerprints” and found a substantial decline in atmospheric chlorine from chlorofluorocarbons (CFCs), which are ozone-depleting substances emitted through old dry cleaning methods, refrigerators, and aerosols.
In 2015, the hole reached a record size, which had scientists puzzled. The hole is estimated to be completely and permanently closed by 2050, provided the world keeps progress steady.