Like, human extraction of oil? No, we don’t dig up anything that isn’t sitting in the crust of the earth. The mantle, sitting between the crust and the outer core, is something around 75x thicker than the crust. We have no impact on what happens to the core.

I wonder how many people on Reddit actually understand that reference at this point.

You generate electricity by manipulating magnetic fields. The easiest way to do this by far is by spinning a magnet around a coil, or a coil around a magnet. Unless we discover something we didn’t already know about magnetic fields, we’re just going to keep spinning things.