Some nations already get all their drinking water via desalination. How is this different?

A reasonable amount of the seawater rise is due to the melting of surface ice in Greenland. The ice is salt free. Perhaps a monster project to harvest this ice and ship it to places that need water would avoid the desalinization process could be more effective. Insane ideas may attract people as the sensible suggestions to reverse global warming are being ignored.

That's the point of Why Not, isn't it -- to think as wildly as possible. My idea is a freaked out reaction to global warming's effect, not just on sea level but on the changing climate that is causing drought all over the planet.

Why not?

Nobody is questioning that you are mentally unstable. That's obvious. And of course an indication that the Princeton Institute For Advanced Study should immediately join forces with the closest psychiatric institute.

Oh, my mistake! I thought you wanted to use the desalinated water for purposes that desalination plants are already used for, like providing all the drinking water for entire nations that have no usable aquifers. Nations that not so long ago relied on whatever rainfall they could catch. I had no idea that desalinated water could be used to combat dry conditions, much less global climate change . . .

My question to you is how is that going to stop the rising sea levels? The water will still flow back to the oceans one way or the other (streams, rivers, clouds, underground sand layers) it all goes back to the seas in time--

Global warming is just one problem heading our way, the other being the decline in affordable energy. Desalinization takes energy.