During the first week of the event, China, the US and the host country Azerbaijan jointly held the Summit on Methane and Non-CO2 Greenhouse Gases. China used the summit to announce a new plan: to reduce the concentration limit for coal mine gas emissions (principally methane) from 30% to 8%. The state will also improve market mechanisms, by allowing companies and enterprises to participate in methane emission controls, and actively promoting international exchanges and cooperation. (Source: Dialogue Earth)