Alternative Energy: A government report says reliance on electric cars will do little to reduce greenhouse gas emissions and may merely shift our dependence on foreign sources from one set of dictators to another..."If you are using coal-fired power plants, and half the country's electricity comes from coal-powered plants, are you just trading one greenhouse gas emitter for another?" asks Mark Gaffigan, co-author of the GAO report. The report itself notes: "Reductions in CO2 emissions depend on generating electricity used to charge the vehicles from lower-emission sources of energy."