IN 1985 a gaping hole was found in the ozone layer above Antarctica. Two years later leaders from around the world signed the Montreal Protocol, a treaty to phase out the substances causing it, known as chlorofluorocarbons (CFCs), which were used in refrigeration and as propellants in...
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Monday, October 10, 2016
The Economist explains: Why world leaders are meeting to discuss hydrofluorocarbons
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