It follows that, if we are not pathologically afraid of plutonium, we can consider fissile uranium as an energy resource (of great compactness) and regard any technique that will produce plutonium from uranium as a renewable resource technology.
The technique for doing so is called a breeder reactor, which arranges that the neutrons which are produced in every fission event are likely either to produce another fission, or to perform the nuclear transformation that makes more fissile fuel from the non-fissile bulk of the uranium in the fuel rods. If operated efficiently for energy production, the plutonium also contains the next isotope, 240Pu, which spoils it for military use. So it is false to say that it is a proliferation-prone technology.
In principle, the same sort of thing can be done with the element thorium, which occurs as 232Th, and can be converted to the fissile 233U.
India has high grade thorium ore, and is planning to use it for a sustainable nuclear power program.
Curiously enough, the amount of coal necessary to fuel a one gigawatt coal power station for a year produces ash containing enough thorium to fuel a nuclear plant of equal capacity for more than a year, if it were refined and neutron irradiated. Coal plant ash is not the best source of thorium, but this illustrates the grossness of the quantities of coal needed to match nuclear power plants. The waste products of coal burning are equally gigantic in quantity compared to nuclear waste.