Except that fusion reactor have a bunch of advantages over all fission designs, including breeder and molten core Thorium, that you conveniently ignore. The bi

Except that fusion reactor have a bunch of advantages over all fission designs, including breeder and molten core Thorium, that you conveniently ignore. The big one is: ramp up time is measured in minutes not days. This is a perfect addition to a grid that gets a large fraction of it's power from (somewhat) variable renewable energy. The next big one is: There is no proliferation risk. No spent fuel that contains isotopes suitable for building fission bombs. And now legitimate reason for uranium enrichment to process your own fresh fuel. In other words there is no reason not to give this technology to North Korea or Iran. The third important one: No radioactive waste that needs to be contained long term. The main "ash" is helium-4 which is not radioactive. The neutron flux will activate parts of the reactor vessel, but the halflifes are generally below a century. General rule of thumb is that things need to be contained 10 halflifes. Humanity has demonstrated successfully that we can build buildings that last 1000 years. This is a big contrast to the waste from fission plants that needs to be contained at least 100000 years, longer than we have had buildings.