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City of Denver and has since been utilized by other cities, including Golden, CO; Broomfield, <br />CO; Portland, OR; Seattle, WA; Austin, TX; and Minneapolis, MN1. <br />All emissions are reported in terms of metric tons of carbon dioxide equivalent (mt- CO2e). <br />There are several major greenhouse gases, including carbon dioxide, methane, and nitrous oxide. <br />Each of these GHG's has a different global warming potential, as shown by Table 2. <br />Table 2: Greenhouse Gases Global Warming Potentials <br />Greenhouse gas <br />Chemical Formula <br />Global Warming <br />Potential <br />Carbon Dioxide <br />CO2 <br />Methane <br />CH4 <br />21 <br />Nitrous Oxide <br />N20 <br />298 <br />Source: Intergovernmental Panel on Climate Change (IPCC), 2007.3 <br />3.1 In- Boundary Activities <br />In- boundary activities include the following energy uses: <br />• Building Energy Use: Emissions attributed to the use of electricity and natural gas by <br />residential, commercial and industrial sectors within a community. <br />• Transportation: Tailpipe emissions attributed to the use of personal and commercial <br />vehicles associated with a community <br />• Waste disposal: Emissions attributed to waste disposal associated with residential, <br />commercial and industrial sectors within the community boundary. <br />• Water and wastewater treatment: Emissions attributed to treatment operations of water <br />used by residential, commercial and industrial sectors within the community. <br />GHG emissions from burning natural gas for heat in buildings and gasoline and diesel fuels in <br />vehicles are considered Scope 1 emissions. GHG emissions from power plants located outside <br />the community boundary which produce energy used within the boundary are termed Scope 2 <br />emissions. <br />11 <br />13 <br />