“Meghan O’Sullivan, the head of the geopolitics programme at Harvard’s Kennedy School, says the shale revolution had bolstered the US internationally by, ‘altering the global strategic environment in a way that made it more conducive to US interests.’

“‘The global energy abundance that was in large part due to American shale… helped US allies and, on the whole, tended to harm its adversaries, from Iran to Russia to Venezuela,’ she adds…”

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