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On June 29, GMF Berlin hosted a dinner discussion for C. Boyden Gray, U.S. Ambassador to the EU, on energy security from a transatlantic perspective, and especially the challenges the United States and Europe face.  Also discussed were issues including energy efficiency, global warming, environment, Russia, and geopolitics.   Ambassador Gray opened the discussion by focusing on general energy security challenges.  He argued that both the U.S. and Europe urgently need to find ways to reduce their dependency on oil, whether from the Middle East or Russia.  This challenge, he says, is directly linked to our security, so we need to find new technologies, new efficiencies, and new natural resources that will enable the United States and Europe to produce more of the energy we need at home, and do so in ways that do not harm the environment.  He said he believes that, because a large part of energy consumption is for transportation, we need to transform the transportation sector if we are to move away from dependency.   About 20 participants attended the dinner, including representatives from business, environmental NGOs, the think tank community, and various federal ministries.