Why protecting the Earth’s ozone layer requires faithful vigilance

April 27, 2018 by  
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Levels change naturally from year to year, which makes it difficult to calculate the exact, short-term impact of industrial activities.

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Why protecting the Earth’s ozone layer requires faithful vigilance

Antarctic ozone layer shows "first fingerprints of healing"

July 1, 2016 by  
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Nearly 30 years ago, almost every country in the world signed the Montreal Protocol to ban chlorofluorocarbons (CFCs) used in refrigerators, aerosols, and dry cleaning. The chlorine in CFCs was said to interact with ozone in the atmosphere to deplete the ozone layer. MIT scientist Susan Solomon’s work helped provide the impetus for the Montreal Protocol, and now she’s the lead author on a study recently published in Science revealing the Antarctic ozone layer may be healing at last. Each year around August, the ozone hole begins to open, and is typically fully formed in October. In the past, scientists have usually scrutinized the ozone hole in October, but Solomon and her team – which includes five other scientists from the National Center for Atmospheric Research in Colorado and the University of Leeds in the UK – decided to switch their focus to September. According to Solomon , “September is a better time to look because chlorine chemistry is firmly in control of the rate at which the hole forms at that time of the year.” The team tracked September ozone hole data between 2000 and 2015. They looked at satellite measurements of ozone and at meteorological changes. Related: New invention uses fluorescent lights to remove air pollution and stinky odors Their findings provide a lot of hope. Chlorine levels in the atmosphere are dissipating, and the ozone hole is shrinking. September’s ozone hole has diminished by over 4 million square kilometers, which is almost ” half the area of the contiguous United States .” The scientist team did see an ozone depletion spike in 2015, but were able to link it to a volcano eruption in Chile. Solomon thinks the ozone hole might even close up in the middle of this century. Solomon said , “We can now be confident that the things we’ve done have put the planet on a path to heal…Science was helpful in showing the path, diplomats and countries and industry were incredibly able in charting a pathway out of these molecules, and now we’ve actually seen the planet starting to get better. It’s a wonderful thing.” Via Phys.org Images via NASA’s Goddard Space Flight Center and Pixabay

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Antarctic ozone layer shows "first fingerprints of healing"

Scientists identify a new chemical contributing to global warming

February 18, 2015 by  
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As if global warming isn’t bad enough, scientists have discovered that a new category of uncontrolled chemicals are depleting the ozone layer and affecting the Earth’s climate. Phys.org reports that a new study recently publishing in the journal Nature Geoscience reveals chemicals not controlled by a United Nations treaty, known as ‘very short-lived substances’ (VSLS), are leading to further depletion of the ozone layer. Read the rest of Scientists identify a new chemical contributing to global warming Permalink | Add to del.icio.us | digg Post tags: CFCs , chemical , climate , Climate Change , dichloromethane , montreal protocol , NOAA , ozone , ozone layer , uncontrolled , university of leeds , vsls

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Scientists identify a new chemical contributing to global warming

The Ozone Hole Above Antarctica is as Big as North America

November 5, 2014 by  
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Data from NASA shows that this year’s hole in the ozone layer above Antarctica remains largely unchanged. On September 9, 2014, it measured 24.1m square km, which is roughly the size of North America; only a little smaller than the largest hole ever observed, which occurred in the same spot in 2000, and much the same as it was at its peak in 2010, 2012 and 2013. Read the rest of The Ozone Hole Above Antarctica is as Big as North America Permalink | Add to del.icio.us | digg Post tags: air pollution , antarctica , CFCs , chlorine , chloroflourocarbons , global warming , hfcs , montreal protocol , ozone , ozone hole , ozone layer , skin cancer , UNEP

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The Ozone Hole Above Antarctica is as Big as North America

The Earth’s Ozone Layer Increases for the First Time in 35 Years

September 12, 2014 by  
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Good news, everyone – a new United Nations report shows that the Earth’s ozone layer has increased for the first time in 35 years. The report credits the recovery in part to the phasing out of chlorofluorocarbons (CFCs) following the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987. Scientists discovered that the ozone layer was thinning above Antarctica in the 1970s, damaging crops and putting people at risk for skin cancer from harmful ultraviolet rays. Read the rest of The Earth’s Ozone Layer Increases for the First Time in 35 Years Permalink | Add to del.icio.us | digg Post tags: Antarctic , CFCs , chemicals , chlorofluorocarbons , earth , montreal protocol , ozone layer , UN

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The Earth’s Ozone Layer Increases for the First Time in 35 Years

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