Yup, but the next stage it gets to is the "Red Giant" stage where it will expand so much that Earth will be orbiting inside the suns atmoaphere. That wont be healthy for life on earth. It will also make the orbiting speed slower, so Earth will sink in deeper and deeper ...
WOW! Talk about your "global warming" problem! Maybe those soothsayers AlGore and Bill Nye are are right?
But from what I remember Mercury, Venus probably Earth and maybe even Mars are in for a rough time if that were to happen. I've also heard a theory or two that says old Sol will skip that Red Giant stage and shrink directly into a white dwarf. A very remote possibility is that Sol would go nova (it doesn't really have the mass to do that), which gives us about 7-1/2 minutes until the side facing the sun feels the effects, about 3/4 of a second before the side facing away feels the effects. But don't worry, you'll never know what happened. One would only be able to observe that from a distant vantage point, and then only after it happened.
A small sized black hole passing through space gets close enough to Earth to suck everything off the surface like a vacuum cleaner but not powerful enough to swallow up the whole planet.
People have different meanings for 'the world to end'. Some mean the actual planet and others mean all life. You need to specify. As far as I know, nothing in nature nearby us is large enough to destroy Earth except our moon. Something very large would have to hit it and cause its orbit to change and fall toward Earth. I like Kittigate's answer too.
Baba 