Times have changed since Tesla's initial investigations of wireless power. Tesla originally envisioned a distributed network of relatively low level suppliers and users of wireless power, and thought it would benefit remote users the most, although he also envisioned large scale power distribution. Our power needs have dramatically increased over the past 100 years, as have their complexity. Tesla expressed great confidence in the viability of wireless power distribution, yet was unable to see its fruition after nearly 50 years of effort. The fulfillment of his vision was undoubtedly impeded by limitation on funds and resources. Tesla demonstrated that the earth can be electrically resonated. The key challenge to feasible worldwide wireless power distribution is whether a means can be found for efficiently coupling power into and out of the cavity formed by the earth, the atmosphere, and the electrosphere/ionosphere. Radiative coupling does not appear to be viable . A conductive approach is proposed which is consistent with Tesla's original wireless concepts; this requires, however, further invention and development. The receiver is the element requiring the most development to make wireless power transfer feasible.

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