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*:/ :11-3 It WA <br />GWP is used to convert GHGs to CO2-equivalence (CO2C) to show the relative potential that different <br />GHGs have to retain infrared radiation in the atmosphere and contribute to the greenhouse effect. For <br />example, under IPCC's Fourth Assessment Report (AR4) GWP values for CH4, a project that generates 10 <br />metric tons (NIT) of CH4 would be equivalent to 250 MT of CO2.11 <br />Table 8 GHG Emissions and Their Relative Global Warmina Potential Compared to CO2 <br />GHGs <br />Second Assessment <br />Report Atmospheric <br />Lifetime <br />ears <br />Fourth Assessment Report <br />Atmospheric Lifetime <br />ears <br />Second Assessment Report <br />Global Warming <br />Potential Relative to CO2' <br />Fourth Assessment Report <br />Global Warming <br />Potential Relative to CO21 <br />Carbon Dioxide (CO2) <br />50 to 200 <br />50 to 200 <br />1 <br />1 <br />Methane2 (CH4) <br />12 (±3) <br />12 <br />21 <br />25 <br />Nitrous Oxide (Nz0) <br />120 <br />114 <br />310 <br />298 <br />Hydrofluorocarbons: <br />HFC-23 <br />264 <br />270 <br />11,700 <br />14,800 <br />HFC-32 <br />5.6 <br />4.9 <br />650 <br />675 <br />HFC-125 <br />32.6 <br />29 <br />2,800 <br />3,500 <br />HFC-134a <br />14.6 <br />14 <br />1,300 <br />1,430 <br />HFC-143a <br />48.3 <br />52 <br />3,800 <br />4,470 <br />HFC-152a <br />1.5 <br />1.4 <br />140 <br />124 <br />HFC-227ea <br />36.5 <br />34.2 <br />2,900 <br />3,220 <br />HFC-236fa <br />209 <br />240 <br />6,300 <br />9,810 <br />HFC4310mee <br />17.1 <br />15.9 <br />1,300 <br />1,030 <br />Peduoromethane: CF4 <br />50,000 <br />50,000 <br />6,500 <br />7,390 <br />Peduoroethane: C2F6 <br />10,000 <br />10,000 <br />9,200 <br />12,200 <br />Peduorobutane: C4Fi0 <br />2,600 <br />NA <br />7,000 <br />8,860 <br />Peduoro-2- <br />methylpentane: C6F14 <br />3,200 <br />NA <br />7,400 <br />9,300 <br />Sulfur Hexafluorlde(SF6) <br />3,200 <br />NA <br />23,900 <br />22,800 <br />Sour. IPGG lWb; IPGG 2UU1. <br />Notes: The GWP values in the IPCC's Fifth Assessment Report (2013) reflect new information on atmospheric lifetimes of GHGs and an improved calculation of the <br />radiative forcing of CO2. Hoy ever, SCAQMD uses the AR4 GWP values to maintain consistency in statewide GHG emissions modeling. In addition, the 2014 Scoping <br />Plan Update was based on the AR4 GWP values. <br />' Based on 100-year time horizon of the GWP of the air pollutant relative to CO2. <br />2 The methane GWP includes direct effects and indirect effects due to the production of tropospher ic ozone and stratospheric water vapor. The indirect effect due to the <br />production of CO2 is not included. <br />California's Greenhouse Gas Sources and Relative Contribution <br />In 2018, the statewide GHG emissions inventory was updated for 2000 to 2016 emissions using the GWPs in <br />IPCC's AR4.12 Based on these GWPs, California produced 429.4 MNYTCO2e GHG emissions in 2016. <br />California's transportation sector was the single largest generator of GHG emissions, producing 40.5 percent <br />of the state's total emissions. Industrial sector emissions made up 23.4 percent, and electric power generation <br />made up 16.1 percent of the state's emissions inventory. Other major sectors of GHG emissions include <br />12 Methodology for determining the statewide GHG inventory is not the same as the methodology used to determine statewide <br />GHG emissions under Assembly Bill 32 (2006). <br />75C-156 <br />