Nuclear energy has saved 1.8 million lives around the world for its part in replacing fossil fuels, according to a study by Pushker Kharecha and James Hansen of NASA's Goddard Institute for Space Studies. In addition to reducing carbon emissions, nuclear would save up to 7 million lives in the next 40 years if it replaced fossil-fuel energy on a large scale, the report says. Kharecha and Hansen developed a model based on deaths caused by various power sources from 1971 to 2009 to develop their conclusions.

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