As noted in a 2014 article by Robert Kaplan in Forbes Magazine: "Geopolitics is the battle for space and power played out in a geographical setting. Just as there are military geopolitics, diplomatic geopolitics, and economic geopolitics, there is also energy geopolitics. For natural resources and the trade routes that bring those resources to consumers are central to the study of geography. Every international order in early modern and modern history is based on an energy resource. Whereas the Age of Coal and Steam was the backdrop for the British Empire in the 18th and 19th centuries, the Age of Petroleum has been the backdrop for the American Empire from the end of the 19th to the early 21st centuries. And indeed, just after other countries and America's own elites were consigning the United States to a period of decline, news began to emerge of vast shale gas discoveries in a host of states, especially Texas. The Age of Natural Gas could make the United States the world's leading geopolitical power well into the new century...." On this edition of ST, we are speaking of such matters -- and of such possibilities -- with Robin Dunnigan, who is the Deputy Assistant Secretary for Energy Diplomacy in the U.S. Department of State’s Bureau of Energy Resources. Ms. Dunnigan recently gave an address to the Tulsa Committee on Foreign Relations entitled "Energy Geopolitics: A U.S. Perspective" -- and she spoke with us while she was here in Tulsa.