My neighbor growing up had this really great idea for solving the energy problem. He hated joggers and cyclers with a passion and proposed to ban such activities alltogether and instead make people with the urge to exercise run in gigantic treadmills to produce electricity.. Do something for your health AND your economy AND your environment - all rolled in one! Triple benefit.. also applicable to prisons, recess in elementary school (honestly, who has more energy than little kids?) and other institutions. It would be green, it would be absolutely emission free - depending on your fitness though - and it could be the new family activity. Uniting the country for a green cause!