We are sadly accustomed by now to the idea that our reliance on oil and gas causes random but predictable outbreaks of flood, firestorm and drought. The weekendsnews from theGulfis a grim reminder that depending on oil leads inevitably to war too.

Depending on how far back you want to stand, thepossibility of war with Iranstems from a calculated decision by Tehran or its Houthi allies to use drones and missiles on Saudi installations, or on the infantile rage that drove President Trump to tear up a meticulously worked out and globally sponsored accord with Iran and to wreck its economy.

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