An Actual Catastrophe

Several decades from now there will be hundreds of millions of people forced to leave low elevation areas due to rising water levels.

The US military's strategic planners view this as an imminent and very real threat to global security due to the massive instability such a mobilization will cause.

Much of the affected area is fertile farm country. The effect on the food supply and infrastructure in adjacent areas will be catastrophic.

You can almost be 100% sure that a psychopathic dictator will attempt to hijack the tragedy for their own benefit.