The most environmental successful treaty ever, the 1987 Montreal Protocol, which banned CFCs, is bearing fruit A t last, there?s some good news. The Earth?s vital ozone layer ? once in dire peril ? is starting to heal. It is eloquent, and timely, testimony that, despite our pessimism about environmental threats, international action can be remarkably effective in defusing them. The United Nations Environment Programme (UNEP) and the World Meteorological Organisation say that ? for the first time in 35 years ? there has been a sustained thickening of the layer, which filters out most lethal ultraviolet radiation from the sun.

Meanwhile, the ozone hole over Antarctica has stopped growing, though it will not start shrinking for another decade and is unlikely to close before mid-century. All this is due to the most environmental successful treaty ever, the 1987 Montreal Protocol, which has phased out the use of chlorofluorocarbons (CFCs) and other ozone-depleting chemicals worldwide. Ratified by all 197 UN states ? the first treaty of any kind to gain universal membership ? it offers hope that the world can beat other global environmental dangers, like climate change.

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