A group of start-ups is promising a new and virtually unlimited source of power, one that produces none of the gases scientists say contribute to global warming.
The only problem? A way to harness the energy source, nuclear fusion — the reaction that gives birth to sunlight — still needs to be invented.
Such an achievement has long evaded government scientists and university researchers, despite decades of work and billions of dollars in research. But backed by hundreds of millions in venture capital and some of the wealthiest people in the technology industry, a handful of young companies say they can succeed where government has fallen short.
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