Nuclear energy, also called atomic energy is the most powerful kind of energy known to mankind ever. 1 kg of Uranium is equivalent to about 20 x 106 kW—hrs of heat energy or burning 2000 tons of high grade coal. This in a way can help us to limit Global warming and emission of toxic gases into the atmosphere.  Care should also be taken to ensure that  the spent fuel of the reactor is disposed off in a safe manner as the radioactive waste pose serious environmental and damage to lives when exposed. With a complete combustion or fission, approx. 8 kWh of heat can be generated from 1 kg of coal, approx. 12 kWh from 1 kg of mineral oil and around 24,000,000 kWh from 1 kg of uranium-235 U235.