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Farsala said:

World War won't come until the vast majority of people are inconvenienced. This won't happen until prices for oil starts becoming unsustainable in 30+ years. Everyone will predict it though, so even then we might pull through and prevent ourselves from killing each other.

Ground water running out everywhere is a issue. (desalination is expensive, and not easy to do)
Global warming, rising sea levels... food scarcity.
On top of the oil becoming prohibitively expensive in the next 30 years.

I could see that leading to wars.