Problem 1: CO2 Emissions (20 points) Household A uses electric heaters and the electricity consumption per year is 3000 kWh. Household B uses gas for heating and the annual gas consumption is 1000 m³. (a) Convert the energy use in both houses into kWh and kg of oil equivalent. (b) Compare the annual CO2 emissions in the two houses. Data: • Average CO2 emission factor for electricity is 0.527 kg/kWh. • CO2 generated by burning natural gas is 0.185 kg/kWh. • With 100% conversion efficiency, 1 tonne of oil equivalent corresponds to 11.6 MWh of electrical energy output. • Assume that the conversion efficiency of the steam turbine generator unit is 35%. • Burning 1 m³ of natural gas provides 11.2 kWh of useful heat energy.