ozone layer

Montreal protocol

The Montreal Protocol, an international agreement signed in 1987 to stop chlorofluorocarbons (CFCs) destroying the ozone layer, now appears to be the first international treaty to successfully slow the rate of global warming.

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Almost 30 years ago the world responded to the realisation that our ozone layer was in trouble. But an alarming recent development shows there is no room for complacency, write Shane Keating and Darry Waugh.