With the increase in the consumption of non-renewable sources for the production of energy in order to satisfy the requirement of mass population, the sources are getting depleted day by day.
Thus, there is a need to overcome the situation for the betterment of the upcoming generations. As the sources are non-renewable, so it cannot get replenished all of a sudden. Therefore, the only way to cope up with the situation without putting the future at stake is to find the alternative sources of energy besides non-renewable fossil fuels.
Hence, the correct answer is option D.