The ozone layer: Thirty years later is recovering, barrier against ultraviolet rays of the sun.
We get good news from Antarctica. The ozone layer, the main barrier against ultraviolet rays of the sun begins to recover. After decades of weakness, the Antarctic hole is down 4 million square kilometers since 2000. That is eight times the size of Spain. Early in the century the ozone layer reached its maximum area of 25 million km2. Almost a decade after the entry into force of the Protocol of Montreal, the largest international effort to save the ozone layer, the trend has reversed. The ozone layer is a layer of gas that filters the sun waves arriving protecting the surface of the earth much of the ultraviolet rays that the sun sends us. In 1985 it was discovered that the layer was disappearing and was forming a hole over Antarctica.
Now scientists have noted not only the shrinking of the hole, but have confirmed that the improvement is due to the ban on chlorofluorocarbons (CFCs) was agreed in Montreal in 1987. CFCs, which until a few years ago found in aerosols, refrigerants and dry cleaning products, they have played a key role in the erosion of the ozone layer. So we can only recognize that is excellent news. Especially after discovering last October that the ozone depletion returned to a record size for those dates. Now researchers claim that the eruption of Calbuco, a volcano in southern Chile, contributed to the cyclical growth of the hole but the trend is to reduction.
"It is expected that the ozone layer recovers, although very slowly. Today we can be confident that the measures we take at the time have put the earth on the road to recovery," according to MIT Professor Susan Solomon, one of the greatest experts in the world on this subject and director of research. And although his team estimated that with this pace of recovery the atmosphere will not be in perfect condition until 2050, Solomon results remind us of the importance of international cooperation to stop climate change.
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