Short-Lived Climate Forcers - MARAMA

CH 4 is an O 3 Precursor• Addressing background O 3 requires reducing emissions of all precursorsglobally–not just NOx!• Global methane emissions have been increasing, and expected futureincreases are likely to offset the benefits of reducing emissions of otherO 3 precursors• Methane emission reductions are available from a variety of sectors, someat very low or no net cost• It doesn’t matter where the methane reductions take place, but the O 3decreases are spread out globally and accrue over time (~ 60% of benefitsare achieved in first 10 years, > 90% of benefits are achieved in 20 years)• Decreasing methane offers a clear “win-win” for climate and air qualityU.S. Environmental Protection Agency – Office of Air and Radiation11