Worldwide wireless power began as a concept with the pioneering work of Nikola Tesla about 100 vears ago. His principal approach is summarized. The viability of such a system must still be demonstrated and many questions remain. Potentially, a wireless system can transfer power more efficiently and flexibly, especially to and from remote regions. The principal elements of worldwide wireless power transfer include: 1) the source: an oscillator/transmitter, 2) the path: the cavity bounded by the earth and the ionosphere and 3) the receiver: a means of extracting power from the path. The system transfers and stores energy via the resonance modes of the cavity. The key challenges facing demonstration of technical feasibility are in finding an efficient means of coupling power into and out of the earth-ionosphere cavity, and in devising a feasible receiver that is both small and efficient. Along with demonstrating technical feasibility, new research must consider safety, environmental impact, susceptibility to weather, and effects on weather.

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