Right now human civilization is running off something like 18TW of energy.
If you add in 2000 kilocalories per day for 7.8 billion people, you add another 750 GW; if you add in a factor of 10 for biological & technological inefficiencies on actually turning electricity into edible calories, you're up to 7.5TW.
As long as you don't throw another factor of 10 on top of that -- imagine growing all food indoors, and then feeding it to cows, before subsisting entirely on beef -- you're probably looking at an amount of energy comparable to that used by humans currently.
Obviously it doesn't make a lot of sense to just switch over to indoor agriculture when there's free sunlight outside, but if we were to do so, the energy demands are probably on a scale comparable to what we're working with already.
So you're probably only halving or so the runway of available uranium.
Right now human civilization is running off something like 18TW of energy.
If you add in 2000 kilocalories per day for 7.8 billion people, you add another 750 GW; if you add in a factor of 10 for biological & technological inefficiencies on actually turning electricity into edible calories, you're up to 7.5TW.
As long as you don't throw another factor of 10 on top of that -- imagine growing all food indoors, and then feeding it to cows, before subsisting entirely on beef -- you're probably looking at an amount of energy comparable to that used by humans currently.
Obviously it doesn't make a lot of sense to just switch over to indoor agriculture when there's free sunlight outside, but if we were to do so, the energy demands are probably on a scale comparable to what we're working with already.
So you're probably only halving or so the runway of available uranium.