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7 <br />In 2015, Residential Energy usage emitted 85,589 MT CO2e which accounted for <br />13% of community emissions. Overall, residential energy emissions are down by <br />16%. Electricity usage rose by 3% over the last 10 years, nearly a 9% increase <br />per household. Even so, due to PG&E’s cleaner energy portfolio, total CO2e <br />emissions from that electricity declined by 10%. <br /> <br />A large portion of the 16% CO2e reductions in residential energy is attributable <br />to a 19% decrease in natural gas usage over the last ten years. While electricity <br />usage remains relatively unchanged by temperature, if there are fewer cold <br />days there is a decrease in usage of gas-powered furnaces. The heating degree- <br />day measurement estimates weather-related heating demand based on outside <br />temperature. In 2015, there were 14% fewer heating degree-days in San <br />Leandro than in 2010 and 25% fewer than in 2005. It is likely that the reduction <br />in natural gas usage is in part due to warmer weather in 2015 than for the <br />previous two inventories. <br /> <br />Solid Waste Disposal <br />When solid waste is landfilled, organic material decomposes in the anaerobic <br />(absent oxygen) environment and releases methane. San Leandro sent 76,725 <br />tons of solid waste to landfills in 2015, resulting in 20,200 metric tons of CO2e. <br />Nearly 30,000 tons of waste were diverted through recycling or composting, a <br />28% diversion rate. Overall, this is a significant 60% reduction in emissions and a <br />50% reduction in tons landfilled since 2005. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Water and Wastewater Treatment <br /> <br />Wastewater treatment in San Leandro is shared between the San Leandro <br />Water Pollution Control Plant and the Oro Loma Wastewater Plant. Greenhouse <br />gases are emitted from the burning of natural gas, use of electricity, and nitrous <br /> - <br /> 10,000.00 <br /> 20,000.00 <br /> 30,000.00 <br /> 40,000.00 <br /> 50,000.00 <br /> 60,000.00 <br /> - <br /> 50,000 <br /> 100,000 <br /> 150,000 <br /> 200,000 <br />2005 2010 2015 MT CO2eSolid Waste TonnageSolid Waste Emissions and Tonnage, 2005-2015 <br />Landfill Tons Landfill Emissions CO2e <br /> - <br /> 20,000 <br /> 40,000 <br /> 60,000 <br /> 80,000 <br /> 100,000 <br /> 120,000 <br />2004 2009 2014MT CO2eResidential Energy Emissions, <br />2005-2015 <br />Gas Electricity Total <br />33