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Table 1 <br />Description of Identified GHG Emissionsa <br />Greenhouse Gas <br />General Description <br />Perfluorocarbons <br />PFCs have stable molecular structures and do not break down through the <br />(PFCs) <br />chemical processes in the lower atmosphere. High-energy ultraviolet rays <br />about 60 kilometers above Earth's surface destroy the compounds. PFCs have <br />very long lifetimes, between 10,000 and 50,000 years. Two common PFCs are <br />tetrafluoromethane and hexafluoroethane. The two main sources of PFCs are <br />primary aluminum production and semi -conductor manufacturing. <br />Sulfur Hexafluoride <br />An inorganic, odorless, colorless, non -toxic, and non-flammable gas. SFs is <br />(SFs) <br />used for insulation in electric power transmission and distribution equipment, <br />in the magnesium industry, in semi -conductor manufacturing, and as a tracer <br />gas for leak detection. <br />Nitrogen Trifluoride <br />An inorganic, non -toxic, odorless, non-flammable gas. NF3 is used in the <br />(NFs) <br />manufacture of semi -conductors, as an oxidizer of high-energy fuels, for the <br />preparation of tetrafluorohydrazine, as an etchant gas in the electronic <br />industry, and as a fluorine source in high power chemical lasers. <br />GHG emissions identified in this table are ones identified in the Kyoto Protocol and other synthetic gases recently <br />added to the IPCC's Fifth Assessment Report. <br />Source: Association of Environmental Professionals, Alternative Approaches to Analyze Greenhouse Gas Emissions <br />and Global Climate Change in CEQA Documents, Final, June 29, 2007, Environmental Protection Agency, Acute <br />Exposure Guideline Levels (AEGLs) for Nitrogen Trifluoride; January 2009. <br />Table 2 <br />Atmospheric Lifetimes and Global Warming Potential <br />Gas <br />Atmospheric <br />Lifetime <br />ears <br />Global Warming <br />Potential <br />(100-year time horizon) <br />Carbon Dioxide CO2 <br />50-200 <br />1 <br />Methane CHa <br />12 +/-3 <br />25 <br />Nitrous Oxide N2O <br />114 <br />298 <br />HFC-23: Fluoroform CHFs <br />270 <br />14,800 <br />HFC-134a: 1,1,1,2-Tetrafluoroethane CH2FCF3) <br />14 <br />1,430 <br />HFC-152a: 1,1-Difluoroethane C2H4F2 <br />1.4 <br />124 <br />PFC-14: Tetrafluoromethane CFa <br />50,000 <br />7,390 <br />PFC-116: Hexafluoroethane C2F6 <br />10,000 <br />12,200 <br />Sulfur Hexafluoride SFs <br />3,200 <br />22,800 <br />Nitrogen Trifluoride NFs <br />740 <br />1 17,200 <br />Source: IPCC, Climate Change 2007: Working Group 1: The Physical Science Basis, Direct Global Warmin <br />Potentials <br />Regulatory Framework: Federal <br />In response to growing scientific and political concern with global climate change, federal and state <br />entities have adopted a series of laws to reduce emissions of GHG emissions to the atmosphere. <br />Cabrillo Town Center <br />Greenhouse. as ec <br />PAGE 7 <br />18-972 <br />City of Santa Ana <br />10/3/2023 July 2023 <br />