That's an interesting point. Obviously, different people in different parts of the world have very different diets and different issues. However, it does feed into that point. One in every five people in the world is now on the move, and those figures will increase. Essentially, you could argue that it is not so much a problem of the number of people. It's when people are situated in areas of the world that are prone to natural disasters and climate change, and disparity in global diets.
However, these great historical forces are very difficult to manage.