Cheap, practical, available in huge quantities: coal is dirty, but far from being done as a source of energy. The largest coal reserves in the world are in the US. The country currently produces half of its energy using coal power plants.The plants are responsible for more than 80 percent of the CO2 emissions of the electricity branch. And according to forecasts by the Department of Energy, their share in energy production will in fact slightly increase by 2030.
