It is first and foremost demographic and the impacts of changing demographics on Europe's culture and way of living. He discusses that the 'native europeans' have birth rates well below that which would be required to maintain a steady population. In some countries such as Russia, Spain and Italy, the trend has gone on at such a rate that reversal is for all intents ad purposes irreversible.

Meantime, there has been a massive migration from the Islamic countries in North Africa and the Middle East. The European Islamic population has a birth rate that is very high. One easy to understand result is that over 30% of the under 18 population in France is Muslim.