Are we living through the origins of the next world war? Certainly, it is easy to imagine how a future historian might deal with the next phase of events in the Middle East:

With every passing year after the turn of the century, the instability of the Gulf region grew. By the beginning of 2006, nearly all the combustible ingredients for a conflict - far bigger in its scale and scope than the wars of 1991 or 2003 - were in place.

The first underlying cause of the war was the increase in the region's relative importance as a source of petroleum. On the one hand, the rest of the world's oil reserves were being rapidly exhausted. On the other, the breakneck growth of the Asian economies had caused a huge surge in global demand for energy. It is hard to believe today, but for most of the 1990s the price of oil had averaged less than $20 a barrel.

A second precondition of war was demographic. While European fertility had fallen below the natural replacement rate in the 1970s, the decline in the Islamic world had been much slower. By the late 1990s the fertility rate in the eight Muslim countries to the south and east of the European Union was two and half times higher than the European figure.