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Greenhouse Gas (GHG) Emissions Inventories <br />Generation -based GHG Inventory <br />Redwood City's first generation -based inventory was completed for 2005 (the baseline year). Beginning in 2010, <br />new community GHG inventories are completed annually, enabling Redwood City to track progress over time. <br />In 2017, Redwood City emitted an estimated 494,944 metric tons (MT) of carbon dioxide equivalent (CO2e) from <br />the residential, commercial, industrial, transportation, waste, and municipal sectors.b In comparison to the base year <br />of 2005, that is a 22.7% decrease in total community emissions. <br />As shown in Figure 8 and Table 1, the two largest categories of emissions are transportation (including highway <br />travel, local travel, and off-road equipment) and building energy use (including residential and commercial/ <br />industrial). <br />The residential and commercial/industrial sectors represent emissions that result from electricity and natural gas <br />used in both private and public sector buildings and facilities. The transportation sector includes emissions from <br />private, commercial, and fleet vehicles driven within the City's geographical boundaries, as well as the emissions <br />from public transit vehicles and the City -owned fleet. Off-road equipment includes lawn, garden, construction, <br />industrial, and commercial equipment. Figure 8 shows the proportion of Redwood City's total GHG emissions from <br />all major sources for 2017. <br />Figure 8: Community Emissions by Sector: 2017 <br />Transportation: Off -Road Equipment <br />11% <br />Transportation: State Highways <br />28.9% <br />Transportation: Caltrain <br /><1% <br />Transportation: Local Roads <br />16.2% <br />gated Waste <br />Commercial/Industry <br />26.9% <br />Wastewater Treatment <br /><1% <br />b Carbon dioxide equivalent is a unit of measure that normalizes the varying climate warming potencies of all six GHG emissions, which are <br />carbon dioxide (CO2), methane (CH4), nitrous oxide (N20), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride <br />(SF6). For example, one metric ton of methane is equivalent to 21 metric tons of CO2e. One metric ton of nitrous oxide is 210 metric tons of <br />CO2e. <br />City of Redwood City Climate Action Plan 36 <br />