Cool technology, large amounts of solar enegy converted like this to stored energy would remove some potential heating power from the energy of the sun, which would be a good thing, but why not use hydrogen?

Its true the round trip efficiency sounds dismal, but this only matters when we know the energy lost cost money, and that the energy lost adds to heat in the environment.

Niether of those apply in the case of solar, what matters is the total heat that can be removed from the energy of the sun over time.

If solar was being used on a domestic and community basis, as is happening naturally anyway (Its scaling up all the time), but will explode when incentivised by issue of solar indexed stimulus, as will have to happen to preserve the energy value in money (Reversiing inflation), the potential to create hydrogen, if all domestic and community installations are equipped to do so (They would have the money to add this via solar indexed stimulus), there would be massive energy put into hydrogen, becauese it would be rewarded financially, and this is when we would see direct effect on global temperature.

Also, the amount of hydrogen produced like this would easily keep all aerospace airborn, whilst still building up, still accumulating to form the heatsink lost historically in fossil fuels.

Would you agree there can be no blanket effect since the atmosphere is adiabatic?