The onset of the 21st century has coincided with mounting scientific evidence of the severe environmental impact of global energy consumption. In response, governments and environmentalists on every continent have begun to re-evaluate the benefits of nuclear power as a clean, non-emitting energy resource. Today nuclear power plants operate in some 30 countries, and nuclear energy has become a safe and reliable source of one-sixth of the world's electricity. This base has the potential to be expanded widely as part of a worldwide clean-energy revolution. Nuclear Energy in the 21st Cen