Alternative energy source
is cheap and cost-effective which is major energy source worldwide. But the devastating effect caused by the fossil fuel such as coal, , and are irreversible. Fossil fuel consumption releases carbon dioxide which affects the environment highly. The energy obtained from the is non-renewable. When our predominant energy is depleted in future we will need an . To overcome these problems, our focus shifts towards . Numerous research is going on worldwide, so that the energy needs of humanity can be met easily, safely and efficiently.