Existing fusion bombs need a fission bomb for ignition. This lower-bounds both the bang and the unpleasant byproducts. A smaller bang can be used much more prac

Existing fusion bombs need a fission bomb for ignition. This lower-bounds both the bang and the unpleasant byproducts. A smaller bang can be used much more practically. For example, 20th-century cars were also powered by explosions. Somehow they outcompeted the previous dominant technology of continuous reactors, steam engines. To dismiss my half-assed idea by pointing to another, I'd bring up something more comparable, like inertial-confinement fusion.