1. Three fourth of the world’s greenhouse gas emissions result from burning of fossil fuels for energy and everyone agrees that the world must rid itself of these fossil fuels that endanger human and other forms of life. Half a century ago, we were told to produce energy at any cost, but in this century, the mission is to move to cleaner renewable energy resources. The important question now is by when will we be able to use only or mainly renewable resources for energy generation. By we, I refer to both India and the world, but in this talk we shall restrict ourselves only to India.