I’m not proposing this as an actual solution, it’s just a dumb idea. But if we dug a huge, wide hole at the bottom of the ocean, or maybe widened the Mariana Trench or something, could that extra space make the sea levels drop enough to keep the land from flooding?
I don’t see any issues as long as you carted away all of the material that you excavated. You could even build up the land to make it taller and harder to flood.
But unless you did it without burning any fossil fuels, then the additional greenhouse gases would cause more ice to melt. And you’d run the risk of fucking up ocean currents and weather systems which, again, could worsen global heating…
On second thoughts, maybe hold off on that plan for now