I recently learned about Magnetism in my high school Physics class, and it made me think of all the applications there are for it. I was especially interested in magnetic induction. I understand that it is dependent on magnetic flux or the movement of the conductor. I'm obviously not an expert on this topic, but it got me thinking: what if the Earth's magnetic field fluctuates? (My main reason for thinking that it does is that the core that produces is it is molten and always shifting, and there is scientific proof that the poles of the Earth's magnetic field shift.) If it does fluctuate, I believe we have a perfectly good resource that we could use to generate clean electricity. P.S. - I did talk to my teacher, and she speculated that because our Earth had been in existence for a very long time, the magnetic field produced by the core has had enough time to form and settle and therefore would not fluctuate?