US to lead climate coalition to reduce non-CO2 pollutants
Aims to slow down global temperature rise by 0.5°C
Countries launch measures to curb greenhouse gases more potent than CO2
A five-step action plan will target pollutants like methane and black carbon
California to cut down emissions of methane, HFCs and black carbon
Reduction in the emissions of short lived climate pollutants can facilitate the post-2015 development agenda