FRUSTRATING stuff, energy - there's masses of it about; unfortunately most of it tends to be in the wrong place and in the wrong form. Geothermal energy is a good case in point. The legacy of the kinetic energy of the colliding debris that formed the Earth some 4.5 billion years ago, plus the heat generated by radioactive decay within the crust, means that the Earth is a thermal energy source of, quite literally, astronomical proportions.
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