What is the oldest form of green energy?



  1. 0 Votes

    The oldest form of green energy could be considered the windmill. As early as 500 A.D., the Persians were converting wind power into mechanical power to grind grain and water pumping. Its not the traditional type of green energy, but it was renewable and environmentally friendly.

Please signup or login to answer this question.

Sorry,At this time user registration is disabled. We will open registration soon!