Full definition
GWP-100 = 28. GWP-20 = 84 (very short-term impact). Short atmospheric lifetime (~12 years). Priority reduction to limit peak temperature. Global Methane Pledge: -30% by 2030 (200+ countries).
Indicator
CH4
Methane
Second main GHG after CO2, ~16% of global emissions, mainly from agriculture (livestock) and fossil fuel leaks.