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I imagine there would be an extremely large energy cost to spraying such boatloads of water in the air.

Wind and solar power both work well in oceans. You could spray water near wind farms during off peak hours, for example.

Solar might not work well if you're generating clouds.

>You could spray water near wind farms during off peak hours

I think underestimate the carbon cost of this infrastructure and the amount of energy needed to send this water into the air. Chances are it's not going to be doing a whole lot and pales in comparison to the amount of water evaporating and going up due to global warming.

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