Tokamaks are good for science and understanding the physics of plasmas, but seem to be particularly unfriendly to utilising the energy produced by fusion. The

Tokamaks are good for science and understanding the physics of plasmas, but seem to be particularly unfriendly to utilising the energy produced by fusion. The materials in the reactor become radioactive and need replacing frequently, diverting the heat out is tricky, but not impossible, as it is essentially a sealed ring. I certainly agree that fusion would be the biggest thing to happen to civilization. It would help us to clean this planet, and get to others.