How do you appreciate the efforts of human beings to discover an alternate energy sources to Coal and Petroleum for their daily use?

Coal and petroleum are exhaustible resources. Moreover, we have also seen that using them leads to various environmental problems like global warming, pollution and etc. These two prime reasons motivate humans to look for some alternative energy sources like Solar energy and wind energy which are inexhaustible and also nonpolluting. Such type of resources is very important for the sustainable development of the country. Hence efforts for the search of such resources is highly appreciated by me.