What is the difference between a renewable and a non-renewable source of energy?
A renewable fuel can be replaced. This would include biomass, you crop it and next year you grow another crop. A renewable source is one that can be used over and over without running out. This includes wind, tidal, solar, geothermal. Also biomass so long as you re-plant as much as you burn. Hydro power is also renewable, because the rain keeps falling.