1. 439 nuclear reactors exist on Earth which generate 2796 TWh. So that is an average 6.3690205011 TWh per nuclear reactor
2. Oil + Coal + Gas + Firewood generate 147872 TWh
3. So we need 147872 / 6.3690205011 = 23217 nuclear reactors.
4. And in the next 45 years the world will consume twice the energy it consumes today.
5. So in 45 years the world needs: 46434 nuclear reactors
6. That means the world has to build:1031 nuclear reactors per year.
7. Currently the world is building:55 nuclear reactors
8. It takes 10 years to build an average nuclear reactor like the 439 that exist today.
9. That means we have to start 10,000 new nuclear reactor projects today to meet the target.

Can we do it? If not then this is the Great Filter.