Nuclear power is a clean source of power as compared to coal based thermal power, except radiation hazards. It does not emit carbon dioxide: green house gas.The cost of power generated is competitive at present market prices and much less as compared to gas,oil,and coal based thermal power. But in thermodynamic cycle , it converts only 28% of the energy into electricity and rest 72% of heat generated in nuclear reactors is rejected to environment and it is a potential source of warming the atmosphere. Hence why we can not say that nuclear power is an agent for global warming and climate change?