AMERICA HAS been a superpower for decades. As a superpower in global energy markets, however, it is barely an adolescent. As recently as 2015 it was illegal to export oil. Within ten years the shale boom has transformed it into the world's biggest producer of crude. No longer must it tiptoe around regimes whose policies it detests but whose oil it craves. President Donald Trump touts an age of "energy dominance". He has put its burgeoning energy prowess to the test with sanctions on Iran and Venezuela. But dreams of dominance are running into the realities of energy markets.
展开▼
