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We present a possible pathway to a global, sustainable energy system by 2050. This new energy scenario follows a comprehensive examination to all aspects of energy use across the entire world and the possible means of supplying this energy from the sustainable sources we have available to us. It does so, from the perspective of actual, physical activities that require energy: our industrial processes, our cars, our buildings. For each of these activities, the scenario asks the questions: • What is the minimum amount of energy required to deliver these functions? • How can we supply this energy in a sustainable way?