The Greatest Flood

Somewhere in 2030, in a chain of events caused by global warming and humanity's poor attempt to halt it, the ocean suddenly started rising, causing almost all landmass to submerge in a month's timeframe. This story begins a week before it happened, on the moment that the holoscreen program you were watching got interupted by a news story warning for the event. You have a week to secure your safety from the events and, if you survive them, will have to keep surviving in the hopes of rebuilding human civilization.