Short-Lived Climate Forcers - MARAMA

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HTAP 2010 FindingsIncreasing Ozone TrendsAverage springtime O 3 levels at remote orhigh-altitude sites across the NorthernHemisphere have shown very consistenttrends.• These trends suggest that t baseline O 3 innorthern mid-latitudes has increased by atleast a factor of two since 1950.• At some sites on the western edge ofcontinental regions, observed levelsapproach or exceed the levels of someambient standards or objectives.
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
Page 1 and 2: Short-Lived Climate ForcersMid-Atla
Page 3 and 4: Comparison of Global Average Radiat
Page 5 and 6: Even aggressive CO 2 reductions, ma
Page 7 and 8: Recent SLCF Activities• Conventio
Page 9: Attaining More Stringent Ozone NAAQ
Page 13 and 14: U.S. Methane Activities• Voluntar
Page 15 and 16: BLACK CARBON:IMPACTS AND MITIGATION
Page 17 and 18: Climate Impacts of BC• BC is most
Page 19 and 20: BC Impacts: GlaciersIn the Himalaya
Page 21 and 22: Global Sources of Black Carbon:(Lam
Page 23 and 24: Mitigation of Black Carbon• Locat
Page 25: Summary of Key Messages fromthis Pr

Short-Lived Climate Forcers - MARAMA

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