I can't write a whole page but I'll give you some ideas. WHAT WILL HAPPEN: As the population gets bigger, there won't be a lot of space for people because as population, we are unevenly spread around the world. For an example, let's take China. China holds about 1.2 billion. There are more than 7 billion people and that's quite a chunk of the population. And in some places like.. Greenland and Canada, there aren't a lot of people at all because of cold. So.. OVERCROWD.
WHAT WILL THE BIGGEST CHANGES BE: With the amount of people growing, we might have as much food for everyone. Just like there is today, Let's take the U.S.A. and Africa. USA has a lot of food and the majority of the people have food everyday. On the flip side, Africais a very poor country and so food is very limited there. so... LESS AND LESS FOOD. Hope I helped!