@Nuclear fuel being limited.
I interviewed with a Nuclear consultancy once. According to them, Nuclear Fuel is effectively limitless.
While you might read there's only "80 years of uranium left", that's only at current prices. If prices went up only a small amount, you'd see a large increase in viable reserves.
Furthermore, the price of Uranium, compared to other electricity generation, is only a small fraction of the cost to run a Nuclear facility (~9%).
Finally, if push came to shove, we could just build Breeder Reactors, which don't ever really "run out" of fuel. However, the Nuclear Engineers I spoke to didn't think the process was worth it at current prices. If things change in the future, we could easily see the mass of spent fuel rods going into reprocessing plants.
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