A new study found that Arctic ozone hole is recovering.
USA Today: Study: Ozone hole over Antarctica beginning to heal
The ozone layer is surrounding the earth, and it is considered to block ultraviolet ray stroke from the sun. Excessive exposure to ultraviolet is harmful to our body. Therefore, the ozone layer is essential for human being.
However, it was several decades ago when ozone hole was observed in the Arctic region. The reason of damaged ozone was some kind of aerosol which is so stable that it reach ozone layer to destroy it. The gas was frequently contained in hair spray and deodorant.
In the late 1980s, many countries made a treaty to limit the production of chlorofluorocarbons (CFCs) which was deemed to cause ozone hole.
The Washington Post: The Antarctic ozone hole has finally started to ‘heal,’ scientists report
It seems effective. Recently, scientists revealed that the ozone hole shrunk by 1.5 million square miles, compared to the size measured in 2000.
It is rarely experienced that the influence of human activity on the environment is proven. Even the presence of global warming is doubted by some researchers. The hypothesis that CFCs is one of the main causes of creating ozone hole is persuasive. And now, there are few possibilities but this hypothesis to explain well the restoring of the ozone layer.
It is a lucky, but certain example that human can treat our environment, reducing pollution to keep the earth sustainable. Other attempts should be respected as well, for the better future.