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Earth's Ozone hole has become the smallest ever since 1988
There's some good news for all those who are concerned about climate change, in fact one of the very few positive news that we have received in recent times.

The giant hole in the Ozone layer that was discovered almost three decades ago has been shrinking and has now become the smallest ever. This hole had reached its peak size in 1988.

But is it big enough to bring harm to human life on Earth? Well, it is about 7.6 million square miles wide. To put it in perspective, that is more than six times the size of India. In 2000, the hole had become 11.5 million square miles wide.

As per scientists, the reason behind this phenomenon is the presence of warm air in the stratosphere that helps keep chemicals that destroy the Ozone away. Mainly chlorine and bromine are the chemicals that destroy Ozone. 

Ozone layer is a layer of gas which protects the Earth from harmful radiation that could result in humans suffering from serious disease including cancer. It is placed about 7 to 25 miles above the Earth. 

The discovery of the hole in the 1970s was the main factor behind countries worldwide signing the Montreal Protocol that pushes countries to enforce limits on pollution. At present, close to two hundred countries are part of the Montreal Protocol.

Mario Molina, who played an important role in the discovery of the hole in the Ozone layer was later awarded Nobel Prize for her efforts. In fact, the gas used in air conditioners and refrigerators was one of the major factors in depleting of the Ozone but their phasing out and replacing them with less harmful gases has also made a significant contribution in containing the hole in the Ozone. 

While this undoubtedly is good news, it should not stop us from pursuing our efforts to protect the Ozone layer. Also, as per a report by NASA, scientists have said that the smaller Ozone hole existing in 2016 and 2017 is due to natural variability and not a signal of rapid healing.

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