I had to call someone so I picked on you.
Hey, that's far out. So you heard him too.
Turn on the TV, we may pick him up on channel two.
World originally meant stuff people do or human life. It therefore got contrasted to Heaven, which is the next world. And from there it came to mean the little planet that the majority of Inky Fool readers call home. Earth, which originally just meant soil (as opposed to, say, water), similarly got saddled with new meaning.