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City of Pleasanton—Hidden Canyon Residences and Preserve <br />Greenhouse Gas Emissions Draft EIR <br /> <br /> <br />3.7-2 FirstCarbon Solutions <br /> https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-07 GHG.docx <br />3.7.3 - Greenhouse Gases <br />Unlike emissions of criteria and toxic air pollutants, which have local or regional impacts, emissions <br />of GHGs that contribute to global warming or global climate change have a broader, global impact. <br />Global warming is a process whereby GHGs accumulating in the atmosphere contribute to an <br />increase in the temperature of the earth’s atmosphere. The principal GHGs contributing to global <br />warming are CO2, CH4, N2O, and fluorinated gases. The primary GHGs of concern are summarized in <br />Table 3.7-1. These gases allow visible and ultraviolet light from the sun to pass through the <br />atmosphere, but they prevent heat from escaping back out into space. <br />Table 3.7-1: Description of Greenhouse Gases of Concern <br />Greenhouse Gas Description and Sources and (Sinks) <br />Atmospheric <br />Lifetime <br /> Percent of US <br />Emissions <br />Carbon Dioxide (CO2) • Fossil fuel combustion <br />• Forest clearing <br />• Cement production <br />• (Plants) <br />50-200 79.7 <br />Methane (CH4) • Livestock <br />• Landfills <br />• Leaks from oil and natural gas <br />production <br />12 11.1 <br />Nitrous Oxide (N2O) • Fertilizers <br />• Manure <br />• Fossil Fuel Combustion <br />• Nylon production <br />• Semiconductor Manufacturing <br />• Wastewater treatment <br />114 6.1 <br />Hydrofluorocarbons (HFCs) • Automobile air conditioners <br />• Refrigerants 1-50,000 <br />3.1 <br />Perfluorocarbons (PFCs) • Primary aluminum production <br />• Semiconductor manufacturing 10,000-50,000 <br />Sulfur hexafluoride (SF6) • Electrical power transmission <br />equipment <br />• Magnesium industry <br />• Semiconductor manufacturing <br />3,200 <br />Nitrogen trifluoride (NF3) • Electronics manufacture for <br />semiconductors and liquid crystal <br />displays <br />740 <br />Source: United States Environmental Protection Agency (EPA). April 11, 2024. Website: <br />https://www.epa.gov/ghgemissions/overviewgreenhouse-gases. Accessed October 13, 2024. <br />