...and again:
One of the most important inventions of Nikola Tesla was was the electrical transmitter. Shortly after leaving his Colorado research facility and returning to New York, Tesla began construction of an gigantic version of this invention, to be known as The Wardenclyffe Tower. Constructed between 1900-1905, the tower stood 187 ft into the air, with a 68 ft metal dome The purpose of the tower was to transmit wireless messages across the Atlantic and, as he had told his financier J.P. Morgan, provide free energy to the entire globe. Tesla believed this to be a simple procedure, and later confirmed through experimentation, that the Earth conducts electricity naturally, much like a metal ball. Tesla hypothesized that Earth could be charged from a single location and energy could be safely extracted from any other point on the globe's surface.
How would you "charge" the earth?