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    "title": "A Brief History of Ozone",
    "description": "Ozone is a colorless gas mainly found in Earth’s stratosphere. It forms a protective layer that absorbs harmful ultraviolet light from the sun. In 1985, an extreme depletion of ozone over Antarctica was discovered—the so-called Antarctic ozone hole. It soon became clear that this drop in ozone was caused by man-made chemicals called chlorofluorocarbons (CFCs). To help solve the global depletion of ozone, the international community regulated CFC production and consumption by adopting the Montreal Protocol in 1987. Although this and subsequent actions have now effectively banned CFC production and put the ozone layer on a path to recovery, long-lived CFCs in the atmosphere continue to effect ozone levels to this day. Watch the video to see more than 30 years of changes in ozone concentrations over the Southern Hemisphere. || ",
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            "description": "See [NASA.gov](http://www.nasa.gov/content/goddard/international-action-against-ozone-depleting-substances-yields-significant-gains/)",
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            "title": "Ozone minimum concentrations, 1979-2013",
            "description": "Visualizations of ozone concentrations over the southern hemisphere.Data is from ozonewatch.gsfc.nasa.gov || ",
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                "alt_text": "Minimum concentration of ozone in the southern hemisphere for each year from 1979-2013 (there is no data from 1995).  Each image is the day of the year with the lowest concentration of ozone.  A graph of the lowest ozone amount for each year is shown. Data is taken from http://ozonewatch.gsfc.nasa.gov/.",
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