So even though the world isn't going to end I thought I'd share my completely 'sane and logical theory on how I believe it would.
Well firstly Adele will part the Earth and rise up from the depths of hell whilst singing "I set fire to the Rain" whilst raining molten acid rain and Satan will protect them both with a forcefield of Satanic magic.
We will then all die in a futile attempt to shield ourselves from the horrible stench of people burning, after it's all over they will sit on their thrones and laugh as Hell's minions rise up from the depths and Shane Harper plays "Dancing In The Rain" whilst the 4 Ponies of the Apocalypse rid the land of all remaining remnants of life.