Usage notes

[
    {
        "data": "The <b>ozone layer</b> is the layer of ozone which settles at between 15 and 30 kilometres altitude and protects the earth from ultraviolet radiation. Stratospheric ozone is formed by the stable form of oxygen, O<sub>2</sub>, being split by ultraviolet radiation, for instance in a lightning strike. It is the major absorber of ultraviolet radiation in the wavelength range 280–320 nanometres which has been shown to be harmful in excessive amounts for plants, animals, and humans. Over the last 50 years the earth’s whole ozone layer has thinned. The density of the ozone layer is not standard around the globe, being least dense over the equator and most dense at latitudes higher than 50° N and 50° S. The discovery in 1985 of a hole in the ozone layer above Antarctica led to the agreement as part of the Montreal Protocol to ban man-made chlorofluorocarbons. Thirty years later in 2015, one of the three UK scientists of the British Antarctic Survey who reported the hole was of the opinion that it could take well into the second half of the twenty first century to repair the ozone layer fully. See also <span data-macquarie-type=\"cross-reference\" data-type=\"link\" data-entry=\"ebec6f0c-e198-325c-8dd6-5cf38996d54a\"><b>ozone</b></span>; <span data-macquarie-type=\"cross-reference\" data-type=\"link\" data-entry=\"46001d81-f0bf-35c2-a933-5c7bfb65dfbd\"><b>ozone depletion</b></span>.",
        "type": "env"
    }
]