Mother Nature Network: In a recent post on ground source heat pumps, I purposely used a photo of a geothermal installation in Iceland to make the point that geothermal energy was a very different thing. Many complained that I obviously didn't know what I was talking about ("The big clue starts with the picture at the top which is NOT a geothermal heat pump system.") Well, duh that was the whole point. Geothermal power is a very different thing and a very important source of renewable energy. With true geothermal energy...