The populations of some countries are shrinking at the same time that the populations of others are shooting into the stratosphere.
Watch the video for some elementary concepts in population change. You should begin to get an idea of why Japan and Europe are shrinking so quickly, while much of the third world is exploding out of all containment.
The shrinking countries are becoming a burgeoning crisis, mainly because the countries which are shrinking the most quickly are some of the most affluent and generous -- in terms of foreign aid and international peacekeeping.
Very few will miss the belligerence of Russia when the Russians are gone, of course, but Europeans have been an important part of the glue that has held the world community together. Without Europe, much of the third world could easily explode into perpetual violence.