Well, I guess then that depends on what you mean by “civilization” ending. If the food runs out, humans will continue to exist, but probably not in a way that

Well, I guess then that depends on what you mean by “civilization” ending. If the food runs out, humans will continue to exist, but probably not in a way that we would consider to be particularly civilized by modern standards. If 3.5 billion people need to turn against the other 3.5 billion to survive, it’s pretty likely that they will.