30 November 2015

Timeline of key events in UN effort against climate change

The flags of the U.N. and France fly as world leaders arrive for the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, Nov. 30, 2015.
After decades of warnings from scientists that greenhouse gas emissions were warming the planet, governments started coming together in the 1980s to combat the problem. Here's a timeline of key moments in the diplomatic effort to stop global warming, leading up to the U.N. climate conference in Paris:
1987: MONTREAL — Governments adopt a treaty pledging to restrict emissions of chemicals damaging the ozone layer. While it doesn't deal with climate change specifically, the Montreal Protocol becomes a model for how to rein in man-made emissions through international agreements.