It looks like we topped out at 411.86 ppm this year.

[VMA131Marine]

9. 28 exajoules of nuclear energy for the entire 20th century

Really? Are you sure about that? Besides which, nuclear reactor construction in the US has a long history of massive cost overruns on construction and lengthy delays in start-up. I note that you haven't mentioned the latest attempt to build a nuke plant in the US has driven Westinghouse Nuclear into bankruptcy.

Also you can't compare energy prices across countries without also noting how taxes play a role. That's why gasoline runs $8-10/gallon in Europe despite having the same underlying commodity price as the US.

I'll also point out that the growth in wind and solar in particular have accelerated in the last 10 years as technology has matured and economies of scale have reduced the cost. Most new wind projects are cost competitive with other forms of generation and there is still room to bend the cost curve.

No matter what you think, the US in particular will not accept the kind of growth in nuclear power that would be required to expand capacity much beyond current levels. Nobody wants a nuke plant in their back yard.

Me, I generated 10 MWh from the solar array on my roof last year at a cost cheaper than buying from the grid.