This is unfortunately how it's going to go. I don't see spraying clouds with salt essentially as being a huge problem as the oceans have a lot of salt so it will likely just fall back in. If it works, it might help to save their reef which is apparently worth billions to their economy. The trade-off is cooling an area that large could cause spin off effects that could affect other parts of the world. I wonder how many climate change deniers are against them doing this? After all if burning a river of oil day after day won't do anything then what would spraying some salt do?
When push comes to shove, a country is going to act in it's own best interests to protect itself. If their climate-patch attempts break some other country's climate like ours, I'm curious to see how we'll treat it. After all it's not like all the manufactured goods and energy we consume could be having an effect on the planet right?