Renewable Energy Source,A Grand Challenge Advantages Examples,A Grand Challenge,Coal, petrol and natural gas have been the three main energy sources all over the world so far.,A Grand Challenge,But all these energy cant be renewable. And it cant be denied that these energy will be ran out in the future.,And then.,Advantages,Environment friendly A wide distribution Reproducible,Examples,Wind Energy,Examples,Hydro energy,Examples,Solar energy,Attention,Nuclear energy,It is renewable energy.,In case of energy shortage, we should develop and make the most use of renewable energy.,Thanks for your attention!,