Cold fusion is a wild goose, there's no evidence that it is even a thing. It's falsification is a textbook case of the scientific method at it's best. Hot fusion we know is possible, there's just a technical hurdle in the way of constructing controlled fusion reactors for commercial purposes. They are completely safe, because fusion requires many precise conditions to work and any damage or problem would cause the process to immediately cease, and without fusion there is no radiation.
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