Nuclear fusion hits energy milestone Total energy input still far higher than output For the first time, fuel for a nuclear fusion reaction has generated more energy than put into it – a scientific milestone. Scientists and futurists have long dreamed of harnessing the energy of nuclear fusion, which powers the sun, here on Earth. An enormous amount of energy is released when multiple atoms collide and fuse to form a new, heavier atom — such as hydrogen fusing into helium. Hydrogen fuel is plentiful in sources such as seawater and the fusion process generates no radioactive waste, greenhouse gases...