Nuclear power contributing to global warming?

Is not the premise behind nuclear power the idea that matter is converted into tremendous amounts of energy? (according to the formula E=mc^2) If this is the case, by converting matter into energy are we not totally destroying the idea of conservation of energy? Doesn't all that extra energy we are bringing... show more Is not the premise behind nuclear power the idea that matter is converted into tremendous amounts of energy? (according to the formula E=mc^2) If this is the case, by converting matter into energy are we not totally destroying the idea of conservation of energy? Doesn't all that extra energy we are bringing into existance have to express itself somehow? Why not as heat? Please correct me if I'm wrong (as I probably am).
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