Re: Points from a briefing
Not just nuclear. All bio and fossil fuels are carbon stores (a carbon battery?) that can be re-charged over years and megania (is this a word? A thousand millennia? It should be!) respectively from an outside power source (the sun).
Unfortunately, all you're really doing is moving energy around (you never 'generate' energy - merely convert it from one form to another, including matter - E=mc2), and will continue doing this until the heat-death of the universe!