[1] Today, the Building Sector consumes about half of the energy produced in the U.S. each year, 68% of which is consumed in the form of electricity. About 48.5% of this electricity is produced by conventional coal-fired power plants. However, 81% of CO2 emissions from electricity generation come from coal-fired power plants. The global climate problem becomes tractable only if CO2 emissions from conventional coal use are phased out by the year 2030, and emissions from unconventional fossil fuels (e.g., oil shale and tar sands) are prohibited (see report here).