The fusion breakthrough is a game changer for global warming and renewable energy

On Tuesday, scientists announced that they had succeeded in creating more energy from a fusion reaction than was used to ignite it, marking a major step forward in the decades-long effort to harness the engine that propels the sun.

The discovery, known as net energy gain, was achieved by researchers at California's Lawrence Livermore National Laboratory, according to the Energy Department. Because fusion occurs at extremely high ....