"Energy Policy, Vol. 39, No. 3. (30 March 2011), pp. 1154-1169, doi:10.1016/j.enpol.2010.11.040"Climate change, pollution, and energy insecurity are among the greatest problems of our time. Addressing them requires major changes in our energy infrastructure. Here, we analyze the feasibility of providing worldwide energy for all purposes (electric power, transportation, heating/cooling, etc.) from wind, water, and sunlight (WWS). In Part I, we discuss...