The Ozone Hole is Lastly Closing Up - Physics-Astronomy.org

The Ozone Hole is Lastly Closing Up

Scientists have establish evidence that the hole in the ozone layer over Antarctica is lastly beginning to heal. If progress continue, it should be closed enduringly by 2050.
The reports comes almost 30 years since the world worked jointly to phase out ozone-depleting chemicals, so we're allowable to give ourselves a little pat on the back. "We can now be sure that the things we’ve done have put the planet on a path to heal," said guide researcher Susan Solomon from MIT.
In the '80s and '90s, the hole in the ozone layer was the environmental threat that everybody was worried about. After decades of pump chlorofluorocarbons (CFCs) into the atmosphere - through dry onslaught, aerosols, and old refrigerators - scientists establish that the ozone over Antarctica had become seriously thin.
That's not huge, seeing as the ozone layer is the shield that absorbs a great deal of the Sun's harmful UV rays before they reach Earth.
To combat the problem, the majority countries on the planet signed the Montreal Protocol in 1987, which was a global treaty that govern the gradual phase-out of CFCs and extra ozone-damaging chemicals.
And currently researchers using new longitudinal capacity have shown that the hole is lastly starting to heal, and has shrunk by 4 million square kilometres since its peak in 2000. That's about half the size of the mainland US.
It did expand to a proof size in 2015 due to the eruption of the Chilean volcano, Calbuco, but if environmental growth continues, the hole should be fully closed by mid-century.
"Which is pretty high-quality for us, isn’t it?" said Solomon. "Aren’t we astonishing humans, that we did something that shaped a situation that we decided collectively, as a world, 'Let’s get rid of these molecules'? We got rid of them, and currently we’re seeing the planet respond."In adding to monitoring the September ozone levels from 2000 to 2015, the team measured the amount of sulphur dioxide emitted by volcanoes every year, which can add to ozone deterioration. They also compare their results with model simulations that predict ozone levels base on the amount of chlorine in the atmosphere each year. 
They found that not just did their observations show that the hole was decrease, it also matched the model's predictions, suggesting that extra than half of the change had been driven by the decreasing chlorine in the atmosphere.
Watch The ozone hole is lastly closing up
"It showed we can in fact see a chemical fingerprint, which is sensitive to the levels of chlorine, lastly emerging as a sign of revival," said one of the researchers, Diane Ivy.
The study, which has been published in Science, also shows that we can in fact fix some of the damage we've complete to the environment when we work together. 
"This is a prompt that when the world gets together, we really can solve ecological problems," Solomon told Gizmodo. "I think we should all pat on the back ourselves on a job well done."

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