Nick Butler is a visiting professor at King's College London and a former senior executive at energy company BP.
The short-term implications of Russia's invasion of Ukraine are already clear.
Opinion
Vital energy revenues are the chink in Putin's armor
Ukraine conflict will have severe repercussions for Moscow
The gas receiving station of the Nord Stream 2 near Lubmin, Germany, pictured on Jan 7: the new pipeline may stand empty. © dpa/AP
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