Countries agree to curb powerful greenhouse gases in largest climate breakthrough since Paris

 Nearly 200 countries struck a landmark deal today to reduce the emissions of powerful greenhouse gases, hydrofluorocarbons (HFCs), in a move that could prevent up to 0.5 degrees Celsius of global warming by the end of this century.

The amendment to the Montreal Protocol on Substances that Deplete the Ozone Layer endorsed in Kigali today is the single largest contribution the world has made towards keeping the global temperature rise "well below" 2 degrees Celsius, a target agreed at the Paris climate conference last year.