Our dependence on fossil fuels - coal, oil and gas - is unsustainable. Solar, wind and tidal power are not nearly sufficient to replace them. There is increasing recognition that nuclear power will have to be used to supply our needs.
However, this meets public resistance. People are worried about safety, about waste disposal, and about the dangers of proliferation. To some degree this mistrust is justified. But these problems can be overcome by an alternative system of nuclear fission, using Thorium as a fuel rather than Uranium.
The reactors are manifestly safe as they never go critical, but use neutrons produced by spallation from a proton accelerator. The problem of long-lived waste is eliminated, and the possibility of diverting material to make weapons is very greatly reduced. This talk will explain the physics of such Thorium power reactors, and present plans for how one might be built.