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Veerabhadran Ramanathan Univ of California at San Diego
INDICATORS OF CLIMATE CHANGE IN CALIFORNIA JUNE 16, 2015 , CALEPA BUILDING, SACRAMENTO
MITIGATE CLIMATE CHANGE & SIMULTANEOUSLY PROTECT
HEALTH, FOOD AND WATER SECURITY
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The Short Lived Climate Pollutants Methane; Black Carbon; Ozone (Lower Atmosphere); HFCs Life times are about a decade or less OFF-THE-SHELF TECHNOLOGIES EXIST FOR DRASTIC REDUCTIONS GIVEN THE SHORT LIFE TIMES, THE CLIMATE EFFECTS OF MITIGATION WILL SHOW UP WITHIN 10 YEARS!!
IS THERE ANOTHER KNOB TO COMPLEMENT CO2 ?
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1975
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CO2 HAS MANY OTHER ROGUE COMPANIONS
Source: IPCC, AR5, 2013
IPCC-AR5 2013
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NEED TO MITIGATE BOTH CO2 AND SLCPS
RAMANATHAN & XU, 2010
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CH4HFCBC
Pre-to 2050: Warming Avoided = 0.7 C Warming Avoided by SLCPs = 0.6 C
Effect of CO2 and SLCPs Mitigation on Global Temperatures Based on Ramanathan and Xu, 2010; Hu, Xu, Tibaldi , Washington and Ramanathan, 2013
CO2SLCP
SLCPs=90%
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UNEP-WMO ASSESSMENT, 2011
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Effect of CO2 and SLCPs Mitigation on Sea Level Rise (SLR) Based on Ramanathan and Xu, 2010; Hu, Xu, Tibaldi , Washington and Ramanathan, 2013
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CO2SLCP
Effect of CO2 and SLCPs Mitigation on Sea Level Rise (SLR)
Based on Ramanathan and Xu, 2010; Hu, Xu, Tibaldi , Washington and Ramanathan, 2013
Pre-Industrial to 2100: 97 cm (50 to 190 cm) Avoided SLR = 35 cm Avoided SLR by SLCPs = 25 cm (71%)
SLCPs=71%
CH4HFCBC
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7,
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Photo:Ramanathan, 2009
Mukteshwar, Central Himalayas, India
THE BOTTOM THREE BILLION WORLD
4 million die every year from smoke pollution
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Identified Technology that reduces emissions
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15
Why is the California Experience Relevant? Report To CARB: Ramanathan et al, 2013
Source: Kirchstetter et al. (2011) Ramanathan et al, 2013: CARB 08-323
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