However, a few possible sources of instability can be mentioned for example,
1. Anti-WMD technology is developing fast among Developed nations.
2. The global energy, nutrition, land and raw materials need is approaching the planet's maximum capacity and its ability to renew it's resources.
3. Economic growth is becoming global (India and China being highlights) and imposing further burdens on the planet's resources. Competition creates the need for economies of scale and Countries may one day look to be of a certain minimum size to achieve that. (we can see this already happening in Europe with the EU)
4. The population growth at an increasing rate forces economies to expand or face mass starvation.
5. Technology into nanotech-Genetics is an area I believe will plant the seeds for many unforeseen results.
6. International Law is loose. When resources grow scarce soon, dis-coordination among countries leaves them often faced with the prisoner's dilemma and rivalry behavior often creates incentive for one country to invade it's competitor.
7. UN is a product of WW2 with powers concentrated on the allied nations but it itself is fundamentally weak resting it core pillar of existence on the good relations and cooperation of the 5 veto nations. It was already shown a history of ineffective effort in overcoming global problems.
The next war will happen - as long as there is peace we will grow and as long as we grow we will eventually reach the limit of sustainability for growth and disequilibrium grows and it take a major event to readjust and bring the cycle full circle. It probably takes a major event to cause the next world war. Instability can build up and is only released when a sequence of events are just right, and the longer it takes for that to happen to bigger is the readjustment. War therefore is not necessary for existence but Just as there can only be a heaven when there's hell, Growth and War are inseparable brothers WE cannot resist indulging in. Truth is plain

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