Less dangerous than Nuclear Splicing (the current form of atomic energy).
Fusion won't generate as much radiation as Splicing, though you need a pretty high temperature. But when you manage to get to that temperature, the process is self sustaining. As long as there is fuel, of course.
Scientists have been able to get the startup process (getting that high temp, under the high pressure) to, like, 75-80 %, for a couple of milliseconds, So we're getting close
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