The Climate and Clean Air Coalition (CCAC) could reduce warming by 0.5°C by 2050, but its work must be done alongside deep cuts in CO₂, according to its interim chief.

The coalition was founded a year ago this week by the USA, Canada, Sweden, Ghana, Mexico, Bangladesh and the UN Environment Programme (UNEP) to target reductions in methane, black carbon (soot), and Hydrofluorocarbons (HFCs), three potent greenhouse gases.