Question

why should we find alternative sources of energy

Answer 1

there are limited stocks of conventional energy sources we have to save them.
as well as conventional energy sources causes pollution which effect on environment .

Answer 2

we should have alternative source of energy because because there is very less less amount and stock of conventional source of energy so we have to use non conventional source of energy for our future use some example of non conventional energy are tidal energy solar energy wind energy geothermal energy nuclear energy etc