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WASHINGTON (AP) — Earth’s protective ozone layer is beginning to recover, largely because of the phase-out since the 1980s of certain chemicals used in refrigerants and aerosol cans, a U.N. scientific panel reported Wednesday in a rare piece of good news about the health of the planet.
Scientists said the development demonstrates that when the world comes together, it can counteract a brewing ecological crisis.
For the first time in 35 years, scientists were able to confirm a statistically significant and sustained increase in stratospheric ozone, which shields the planet from solar radiation that causes skin cancer, crop damage and other problems.
From 2000 to 2013, ozone levels climbed 4 percent in the key mid-northern latitudes at about 30 miles up, said NASA scientist Paul A. Newman. He co-chaired the every-four-years ozone assessment by 300 scientists, released at the United Nations.
“It’s a victory for diplomacy and for science and for the fact that we were able to work together,” said chemist Mario Molina. In 1974, Molina and F. Sherwood Rowland wrote a scientific study forecasting the ozone depletion problem. They won the 1995 Nobel Prize in chemistry for their work.
The ozone layer had been thinning since the late 1970s. Man-made chlorofluorocarbons, called CFCs, released chlorine and bromine, which destroyed ozone molecules high in the air. After scientists raised the alarm, countries around the world agreed to a treaty in 1987 that phased out CFCs. Levels of those chemicals between 30 and 50 miles up are decreasing.
The United Nations calculated in an earlier report that without the pact, by 2030 there would have been an extra 2 million skin cancer cases a year around the world.
Paradoxically, heat-trapping greenhouse gases — considered the major cause of global warming — are also helping to rebuild the ozone layer, Newman said. The report said rising levels of carbon dioxide and other gases cool the upper stratosphere, and the cooler air increases the amount of ozone.
And in another worrisome trend, the chemicals that replaced CFCs contribute to global warming and are on the rise, said MIT atmospheric scientist Susan Solomon. At the moment, they don’t make much of a dent, but they are expected to increase dramatically by 2050 and make “a big contribution” to global warming.
The ozone layer is still far from healed. The long-lasting, ozone-eating chemicals still lingering in the atmosphere create a yearly fall ozone hole above the extreme Southern Hemisphere, and the hole hasn’t closed up. Also, the ozone layer is still about 6 percent thinner than in 1980, by Newman’s calculations.
Ozone levels are “on the upswing, but it’s not there yet,” he said.
Achim Steiner, executive director of the U.N. Environment Program, said there are encouraging signs that the ozone layer “is on track to recovery by the middle of this century.”
Steiner called the effort to get rid of ozone-destroying substances “one of the great success stories of international collective action in addressing a global environmental change phenomenon.”
“More than 98 percent of the ozone-depleting substances agreed over time have actually been phased out,” he said. If not for such efforts, Steiner said, “we would be seeing a very substantial global ozone depletion today.”
Paul Wapner, a professor of global environmental politics at American University, said the findings are “good news in an often dark landscape” and send a message of hope to world leaders meeting later this month in New York for a U.N. climate summit.
“The precedent is truly important because society is facing another serious global environmental problem, namely climate change,” said Molina, a professor in San Diego and Mexico City. The 71-year-old scientist said he didn’t think he would live to see the day that the ozone layer was rebuilding.
Earlier this week, the United Nations announced that atmospheric levels of the main greenhouse gas, carbon dioxide, surged to another record high in 2013. The increase from 2012 was the biggest jump in three decades.

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Just over a quarter century ago, the world united to reverse the rapid depletion of the atmospheric ozone layer, which protects Earth from harmful radiation from space. Today, the ozone layer is well on track to recovery within the next few decades.

The Montreal Protocol on Substances that Deplete the Ozone Layer is widely recognized as one of the most successful environmental treaties in history. It establishes legally binding controls on the national production and consumption of ozone-depleting substances, and enjoys universal ratification by 197 parties.

Recent scientific findings reveal the importance of the Montreal Protocol. Without the Protocol and associated agreements, atmospheric levels of ozone-depleting substances could have increased ten-fold by 2050. Concerted action has prevented millions of cases of skin cancer.

The Protocol has also significantly contributed to the fight against climate change, as many ozone-depleting substances are powerful greenhouse gases. Climate change is affecting communities, economies and ecosystems across the globe. It is essential that we act to mitigate the threat with the same unity of purpose as we have in facing the dangers of ozone depletion.

Let us take inspiration from our efforts to preserve the ozone layer. The Montreal Protocol has shown that decisive action by the international community, including the private sector, can achieve transformative results for the common good. Let us learn from this example and apply its lesson to the urgent task of addressing the climate challenge.

The National Ozone Unit of Grenada joins the international community to celebrate International Day for the preservation of the ozone layer.

This year’s celebration under theme; Ozone Layer Protection: the Mission Goes On, is of particular relevance in the context of the achievements of the Montreal protocol on substances that deplete the ozone layer and the future challenges that confronts Grenada and the rest of the world.

We celebrate in 2014 with the recent announcement on September 11 by the world’s leading atmospheric scientists who announced that the ozone layer is in fact recovering.

This recovery is largely due to parties to the Montreal Protocol, including Grenada,that has for the last 27 years of the Protocol’s existence has made significant contributions in addressing the global problem of ozone layer depletion.

These atmospheric observations have indicated that the levels of ozone depleting chemicals in the stratosphere is declining.

Mr. Achim Steiner, Executive Director of the United Nations Environment Programme (UNEP), highlighted that there are encouraging signs that the ozone layer is on track to recovery by the middle of this century.

The NOU feels gratified with this outcome since Grenada has been actively involved in the global effort to rid the planet of ozone depleting chemicals since 1993, when Grenada ratified the Montreal Protocol. To date more than 98% of the ozone depleting chemicals have been phased out globally.

While we are gratified by these achievements, the NOU warns that we should not become complacent in our efforts. We also warn that in the replacement of the ODSs, concern should be exercised in the potential to introduce potent greenhouse gases as alternatives. We strongly advocate the need to protect the ozone layer as our mandate, but to also achieve the synergistic benefits of climate protection and improved energy efficiency.

The NOU would like to recognize and commend all partners in this process that have been contributing to the success of the Montreal protocol programme in Grenada; the Customs and Excise Department, importers of Refrigerants and Refrigeration and Air-Conditioning (RAC) equipment, the Association of RAC technicians, customs brokers, T A Marryshow Community College and the Ministry of Finance and Energy.

Protecting Ozone is protecting you. Ozone Friendly Planet is our Target! Let us protect the atmosphere for generations to come.

Ozone Layer Protection: The Mission Goes On in Grenada