Recently, scientists announced that the Ozone Hole over Antarctica, detected in the 1970s, was gradually closing as a result of action taken by International Treaty. The announcement was made at the 2012 [Edit: 2011 actually] Fall Meeting of the American Geophysical Union in San Francisco.
The Montreal Protocol agreed the banning of CFCs (chlorofluorocarbons) from 1989. The substances were used as coolants for refrigeration, as a component for aerosol sprays and some other industrial applications."Ozone-depleting substances are declining as we expected," Newman [an atmospheric chemist with NASA] said. "The Montreal Protocol has led to that decline, and we expect them to continue to decline in the future."
Ozone levels are projected to return to 1980 levels by 2032, he said.
In a world without the Montreal Protocol, two-thirds of the ozone layer would have been destroyed by 2065, and the UV index, a measure of the strength of the sun's ultraviolet rays, would have tripled, with the tropics seeing a particularly large increase in UV rays reaching Earth's surface.
Climate Success Story: Saving the Ozone Layer | Montreal Protocol & Saving the Protective Ozone Layer | Ozone Hole, Greenhouse Gases & Climate Change | LiveScience
Montreal Protocol - Wikipedia, the free encyclopedia
The Nobel Prize in Chemistry was shared in 1995 as a result of the Ozone Depletion work - Paul Crutzen, Mario Molina and Sherwood Rowland received the award
This happy progress shows that the world can agree to reduce the release of harmful substances into the atmosphere, that such action can work and the science behind the action is sound.