No idea what their plan is. Probably nonsensical.
Oceans will indeed rise again and future generations will have to deal with it. But first we will end our current interglacial period (might happen in a few thousand years or so) and resume a full-bore ice age that would last maybe 100K years or so. That will result in massive relocations and starvations. Huge problem to be faced someday.
Then as the ice subsides another interglacial starts up and the melting glaciers would raise the seas 20-30 feet or so. More problems. These are not modeled nonsense but based on hard data that tell us this planet experiences ice age cycles every 120K years or so.
Future problems that these “climate scientists” have no clue how to deal with. If the leftists would just get out of the way technologies could develop and future peoples would have the resources with these real problems they will face.
Instead they want to squander precious resources using our primitive existing technologies chasing CO2 levels. Chasing ghosts. Nuts.
They pre-determine which technologies to pursue, and they exclude all others, and only fund and encourage the ones they want. Extremely destructive control freaks.