请问HN：利用地磁场进行电力生成的实用性如何？
多年前我会在“Overflows”上问这个问题。可惜，那些无忧无虑的日子早已过去。我可以随时问人工智能，但你怎么能确定呢？
地球产生一个移动的磁场（虽然强度较小，但范围很大，对吧？）。移动的磁场会产生电流，对吗？如果有合适的技术解决方案，能否将“地磁能”与其他清洁/可再生能源结合起来，还是说这在根本上是不可能的？
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Years ago I would have asked this on the 'Overflows. Alas, those innocent days are long gone. I could always ask AI, but how can you know?<p>The Earth produces a moving magnetic field (small teslas, but large extent yes?). Moving magnetic fields produce electrical current, right? Could you add "geomagnetic power" to other clean/renewable sources with the right technical solution, or is it fundamentally impossible?