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, some of the plutonium captures a neutron which converts it to the next isotope, 240Pu94, which spoils it for military use.
It is easier to separate 238U92 from 235U92 than 240Pu94 from 239Pu94. So it is false to say that it is a proliferation-prone technology.
Besides which, because the reprocessing is done by unattended radiation-resistant machines within the nuclear facility, a would-be thief will be dead before he can get away with his deadly booty.
In principle, the same sort of thing can be done with the element thorium, which occurs as 232Th91, and can be converted to the fissile 233U92.
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.