Why are we looking at alternate sources of energy ?

Explanation

Fossils fuels were formed due to extraordinary conditions that prevailed on the Earth many million years ago. No new reservoirs of these fuels are being formed due to the absence of those conditions. As such fossil fuels are non-renewable sources of energy. In case we continue to use these sources at the present rate, we would soon be deprived of these sources. It is due to this reason that we should conserve these sources and look for alternate sources of energy.