If all the resources of fossil fuels finish then the inexhaustible renewable resources can be used like solar energy, wind energy, biodiesel, geothermal energy and hydroelectricity. Out of these solar energy, hydroelectricity and wind energy are already being in use in many parts of the world. Though the method of extraction of these energy resources is little expensive like the putting of the solar panels, constructing large dams for production of hydroelectricity, etc also some environmental concerns have to be kept in mind. But a small investment on these can result in a better and non-polluting future.