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You don't necessarily need tritium, and things like ITER and the stellaratar design are very inefficient. They just want tritium because it makes fusion more attainable with such inefficiencies. If you can find an efficient enough way of making it happen though, you can use a variety of different fuels.

Plasma collapse generators have a bunch of potential and become more efficient as they're scaled down. The safire project also looks interesting; it utilizes nuclear plasma physics that we don't fully understand yet. https://www.youtube.com/watch?v=7GFFfmBGb5U&t=1s

Uhhh... It's a byproduct of any water-based fission reactor. And modern design fission reactors produce less radioactive materials than coal plants.