An annual sunlight increase of 0.00000001 % is close enough to "constant" to make no difference. And I didn't even bother with compounding, so the real number is even smaller. It's dwarfed by other solar cycles, and those are dwarfed by the near-doubling of CO2 in our atmosphere.

I'm not automatically against geo-engineering approaches, but we do need to consider them desperate moves compared to the reduction of the GHGs