If we faced a countdown to destruction, could we find a way to survive? In a series of terrifying scenarios, Nat Geo explores how we could unite to ensure the survival of the human race.

Could humanity survive if the planet were ravaged by a bizarre and deadly weather phenomenon? There may be hope if we can adapt to a new Earth.

Explore the terrifying consequences of flash floods and rising sea levels as experts explain how a massive volume of water might come to earth from space.