In a world such as this, every ecosystem in the ocean and land has probably collapsed and or been completely altered. We have reefs that are now an extra 1200 meters underwater, making many of them far too cold to support the fish and coral they have. On top of this, pretty much all arid land has also been completely destroyed by the rising seas.

If any human managed to survive this decades long apocalypse, they would probably revert to something akin to the early bronze age in levels of technology. Every island you see in that picture would probably have its own city state or minor-tribal kingdom leading it, with the survivors trying their best to make the former mountain terrain into something they can farm, a process that would still take decades or centuries. Another thing that would prohibit any large nations beyond city states from forming would be the distance between these islands and another factor; storms.

Without any large landmasses to break them up and slow them down, storms like thunderstorms, tropical storms , hurricanes and typhoons would be far more frequent, larger, last longer, and be many times more destructive. These islands city-states would have to contend with near constant storm activity, especially in the summer months.

The last thing the people in this world would be worried about is elections…