America's Energy OpportunityThis article, published by Foreign Affairs in 2013, "discusses increased energy production in the U.S. as of April 2013, with information on crude oil, natural gas, and renewable energy from wind, solar, and geothermal sources. Topics include the potential for U.S. energy independence posed by the expansion of shale gas and petroleum production, the impact of a diversified energy industry on the U.S. economy, national security, and environmental protection, and the challenges posed by the demands of foreign policy, climate change, and high energy costs."