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6.A. - Page 50 of 251 <br />Greenhouse Gas (GHG) Emissions Inventories <br />Solid Waste Emissions <br />In 2017, waste sector emissions accounted for 11 percent of total 2017 GHG emissions in Redwood City. Over <br />73,360 tons of solid waste were sent to landfills. Waste emissions result from organic material decomposing in the <br />anaerobic conditions present in a landfill and releasing methane (CH4) — a GHG 28 times more potent than CO2. <br />Organic materials (e.g., paper, plant debris, food waste, etc.) generate methane within the anaerobic environment <br />of a landfill while non-organic materials (e.g., metal, glass, etc.) do not. Table 2 shows the approximate breakdown <br />of the materials Redwood City sent to landfills in 2017. Materials that do not release GHGs as they decompose are <br />included in the "Non-organic Material" category. <br />Table 2: Estimated Waste Composition40 <br />Non-organic Material <br />56.9% <br />Organic Material <br />43.1% <br />Food Scraps <br />15.5% <br />Dimensional Lumber <br />14.5% <br />Corrugated Containers <br />4.8% <br />Officer Paper <br />1.9% <br />Grass <br />1.9% <br />Leaves <br />1.9% <br />Newspaper <br />1.3% <br />Magazines/Third Class Mail <br />0.7% <br />Branches <br />0.6% <br />City of Redwood City Climate Action Plan 39 <br />355 <br />