Nuclear power may have saved 1.8 million lives otherwise lost to fossil fuels, may save up to 7 million more.

http://blogs.scientificamerican.com/the-curious-wavefunction/2013/04/02/nuclear-power-may-have-saved-1-8-million-lives-otherwise-lost-to-fossil-fuels-may-save-up-to-7-million-more/