The old joke about fusion is that it is 30 years from becoming a reality — and that’s been the case for the last 50 years or more. It’s a joke that may quickly be reaching its sell-by date.

And a good thing too. The promise of fusion is near-unlimited energy that produces almost no waste.

Traditional nuclear reactors split atoms to create energy. These fission reactors run on processed uranium and leave behind radioactive waste. Fusion, on the other hand, is the same process that keeps the sun shining. Fusion reactors would run on abundant hydrogen isotopes and, in theory, create significantly more energy than fission with comparatively little waste.

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