- Thanks to the Montreal Protocol, an international agreement signed in 1987 to stop CFCs from destroying the ozone layer, today’s global temperatures are considerably lower. And by mid-century, the Earth will be – on average – at least 1°C cooler than it would have been without the agreement. https://climateextremes.org.au/montreal-protocol-set-to-slow-global-warming-by-at-least-1c/ 124 comments science