You can save yourself money and help clean up the environment by reducing your energy consumption with easy-to-do Green Investment measures. Calculations for O3, CO, CO2, CH4, N2O, HFCs, CFCs, NOx, PM10, PM2.5, SO2, HAPs and VOC reductions are based on megawatt hours of energy (MWh, or Btu), and avoided millions of tons of air pollution (MtC, or CO2, or Green House Gas).