It is called a revolution in energy and a game-changer. Daniel Yergin claims that “the rapidity and sheer scale of the shale breakthrough—and its effects on markets—qualified it as the most significant innovation in energy so far since the start of the twenty-first century.” President Obama has proclaimed that the United States is “the Saudi Arabia of natural gas.” Over the course of the next several years, we are likely to witness a dramatic evolution in energy. It will not be overnight, but it is likely that there will be steady movement away from coal and petroleum and toward natural gas.