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PLACEWORKS 4.6-3 <br />SAN LEANDRO SHORELINE DEVELOPMENT DRAFT EIR <br />CITY OF SAN LEANDRO <br />GREENHOUSE GAS EMISSIONS <br />TABLE 4.6-1 GHG EMISSIONS AND THEIR RELATIVE GLOBAL WARMING POTENTIAL COMPARED TO CO2 <br />Second Fourth <br />Atmospheric <br />Assessment Report Assessment Report <br />Lifetime <br />Global Warming Global Warming <br />GHGs (Years) <br />Potential Relative to CO2a Potential Relative to CO2 <br />Carbon Dioxide (CO2) 50 to 200 <br />1 1 <br />Methane (CH4)` 12 (±3) <br />21 25 <br />Nitrous Oxide (N20) 120 <br />310 298 <br />Hydrofluorocarbons: <br />HFC -23 264 <br />11,700 14,800 <br />HFC -32 5.6 <br />650 675 <br />HFC -125 32.6 <br />2,800 3,500 <br />HFC -134a 14.6 <br />1,300 1,430 <br />HFC -143a 48.3 <br />3,800 4,470 <br />HFC -152a 1.5 <br />140 124 <br />HFC-227ea 36.5 <br />2,900 3,220 <br />HFC-236fa 209 <br />6,300 9,810 <br />HFC-4310mee 17.1 <br />1,300 1,030 <br />Perfluoromethane: CF4 50,000 <br />6,500 7,390 <br />Perfluoroethane: C21`6 10,000 <br />9,200 12,200 <br />Perfluorobutane: C41`10 2,600 <br />7,000 8,860 <br />Perfluoro-2-methylpentane: C6F14 3,200 <br />7,400 91300 <br />Sulfur Hexafluoride (SF6) 3,200 <br />23,900 22,800 <br />Notes: The IPCC has published updated global warming potential (GWP) values <br />in its Fifth Assessment Report (2013) that reflect new information on <br />atmospheric lifetimes of GHGs and an improved calculation of the radiative forcing of CO2 (radiative forcing is the difference of energy from sunlight <br />received bythe earth and radiated back into space). However, GWP values <br />identified in the Second Assessment Report are still used by BAAQMD to <br />maintain consistency in GHG emissions modeling. In addition, the 2008 Scoping Plan was based on the GWP values in the Second Assessment Report. <br />a. Based on 100 -Year Time Horizon ofthe GWP ofthe air pollutant relative <br />to CO2. Intergovernmental Panel on Climate Change. 2001. Third Assessment <br />Report: Climate Change 2001. New York: Cambridge University Press. <br />a. Based on 100 -Year Time Horizon of the GWP ofthe air pollutant relative <br />to CO2. Intergovernmental Panel on Climate Change. 2007. Fourth Assessment <br />Report: Climate Change 2001. New York: Cambridge University Press. <br />c. The methane GWP includes direct effects and indirect effects due to the <br />production of tropospheric ozone and stratospheric water vapor. The indirect <br />effect due to the production Of CO2 is not included. <br />Sources: Intergovernmental Panel on Climate Change, 2001, Third Assessment <br />Report: Climate Change 2001, New York: Cambridge University Press; and <br />Intergovernmental Panel on Climate Change, 2007, Fourth Assessment Report: Climate Change 2001, New York: Cambridge University Press. <br />PLACEWORKS 4.6-3 <br />