Ironically, this is perhaps the smallest problem facing practical civil fusion power. Probably the biggest problem is wasting time and budget on such dead-end

Ironically, this is perhaps the smallest problem facing practical civil fusion power. Probably the biggest problem is wasting time and budget on such dead-end technology as Tokamak, which can never in anybody's wildest dream be competitive with renewables, even given abundant tritium. But the conceivably useful D-3He aneutronic fusion depends on a supply of 3He, which is uniquely a product of tritium decay, and thus also depends on a tritium supply. Thus D-3He would not be useful for baseload civil power, either. But it could be the only useful power source for projects in the outer solar system, for which a much smaller amount of 3He would suffice. It is hard to imagine another power source adequate in the outer solar system (aside from pB11 fusion which would be super if it is actually possible at all). (No, mining 3He from the moon would totally not work at all.)