Milling Heat

摘要

Heat emanating from the Earth's core could replace a substantial percentage of the energy currently produced by burning gas, oil and coal for electricity generation. The Earth's heat is an inexhaustible resource whose use creates almost no greenhouse gas emissions. It is, in short, a nearly perfect solution to the world's energy needs. But before the world can take advantage of this abundant supply of heat, there are daunting economic and technological hurdles to clear.