When will the world end?

Which world?  And what do you mean by end ?

A world may lose its integrity but the matter which was the world will continues to exist. ://

As far as YOU are concerned, it will end when YOU die.    

In about 5 BILLION years when our Sun becomes a red giant it will consume the earth.....the PLANET will no longer exist in an intact planet form.   Asteroid impacts or other anomolies COULD occur before then to obliterete the planet.

II will end when it wants to or if their is no more clean water.

I vote water pullosion for ending because it will probably happen.