{"id":25496,"date":"2014-09-12T11:12:01","date_gmt":"2014-09-12T03:12:01","guid":{"rendered":"https:\/\/canadianinquirer.net\/v1\/?p=25496"},"modified":"2014-09-11T23:44:04","modified_gmt":"2014-09-11T15:44:04","slug":"scientists-say-ozone-layer-is-recovering-credit-phase-out-of-aerosol-chemicals-since-the-80s","status":"publish","type":"post","link":"https:\/\/canadianinquirer.net\/v1\/2014\/09\/12\/scientists-say-ozone-layer-is-recovering-credit-phase-out-of-aerosol-chemicals-since-the-80s\/","title":{"rendered":"Scientists say ozone layer is recovering, credit phase out of aerosol chemicals since the \u201880s"},"content":{"rendered":"

\"shutterstock_130181342\"<\/a><\/p>\n

WASHINGTON\u2014Earth\u2019s 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.<\/p>\n

Scientists said the development demonstrates that when the\u00a0world\u00a0comes together, it can counteract a brewing ecological crisis.<\/p>\n

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.<\/p>\n

From 2000 to 2013, ozone levels climbed 4 per cent 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.<\/p>\n

\u201cIt\u2019s a victory for diplomacy and for science and for the fact that we were able to work together,\u201d 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.<\/p>\n

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\u00a0world\u00a0agreed to a treaty in 1987 that phased out CFCs. Levels of those chemicals between 30 and 50 miles up are decreasing.<\/p>\n

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\u00a0world.<\/p>\n

Paradoxically, heat-trapping greenhouse gases\u2014considered the major cause of global warming\u2014are 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.<\/p>\n

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\u2019t make much of a dent, but they are expected to increase dramatically by 2050 and make \u201ca big contribution\u201d to global warming.<\/p>\n

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\u2019t closed up. Also, the ozone layer is still about 6 per cent thinner than in 1980, by Newman\u2019s calculations.<\/p>\n

Ozone levels are \u201con the upswing, but it\u2019s not there yet,\u201d he said.<\/p>\n

Achim Steiner, executive director of the U.N. Environment Program, said there are encouraging signs that the ozone layer \u201cis on track to recovery by the middle of this century.\u201d<\/p>\n

Steiner called the effort to get rid of ozone-destroying substances \u201cone of the great success stories of international collective action in addressing a global environmental change phenomenon.\u201d<\/p>\n

\u201cMore than 98 per cent of the ozone-depleting substances agreed over time have actually been phased out,\u201d he said. If not for such efforts, Steiner said, \u201cwe would be seeing a very substantial global ozone depletion today.\u201d<\/p>\n

Paul Wapner, a professor of global environmental politics at American University, said the findings are \u201cgood news in an often dark landscape\u201d and send a message of hope to\u00a0world\u00a0leaders meeting later this month in New York for a U.N. climate summit.<\/p>\n

\u201cThe precedent is truly important because society is facing another serious global environmental problem, namely climate change,\u201d said Molina, a professor in San Diego and Mexico City. The 71-year-old scientist said he didn\u2019t think he would live to see the day that the ozone layer was rebuilding.<\/p>\n

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.<\/p>\n

Online<\/h6>\n

United Nations ozone program:\u00a0http:\/\/ozone.unep.org\/new_site\/en\/index.php<\/a><\/p>\n

Associated Press writer Edith M. Lederer at the United Nations contributed to this report.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

WASHINGTON\u2014Earth\u2019s protective ozone layer is beginning to recover, largely because of the phase-out since the 1980s of certain chemicals used …<\/p>\n","protected":false},"author":44,"featured_media":25497,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5742],"tags":[],"class_list":["post-25496","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science-2","mauthors-seth-borenstein","mauthors-the-associated-press"],"_links":{"self":[{"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/posts\/25496","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/users\/44"}],"replies":[{"embeddable":true,"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/comments?post=25496"}],"version-history":[{"count":0,"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/posts\/25496\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/media\/25497"}],"wp:attachment":[{"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/media?parent=25496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/categories?post=25496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/canadianinquirer.net\/v1\/wp-json\/wp\/v2\/tags?post=25496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}