So generators in, eg windmills, push magnets that cause electrons to move. I was reading something and it occurred to me, where do these electrons come from? It sounds like they must come form nearby atoms of metal. Doesn't that mean that there is a lifespan on even renewable energy? I get that materials wear down as well. But if the electrons have to come out of metal or matter as the generator turns and moved the magnet to push the electrons how does that make it 'renewable'. Just sounds like coal with less negative outputs