What does the nuclear fusion breakthrough mean?

U.S. Scientists Make Major Fusion Energy Breakthrough

To create fusion ignition,laser energy is converted into X-rays, which then compress a fuel capsule until it implodes Source: AAP / Lawrence Livermore National Labo/ratoryCover Images

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Scientists in California have announced a major breakthrough in nuclear fusion technology, for the first time producing more energy in a fusion reaction than was used to ignite it. So what is nuclear fusion, and why are some experts concerned?

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