Whatever source of energy we develop and use, it'll never be enough due to the way we (humans) squander it. I've often thought that if we were ever to develop a source of inexhaustible 'free' energy, it would spell disaster for much of the life on this planet. We'd simply waste it to process every natural resource available and for monkey-brain beguiling friviolities and in doing so spoil the natural world even faster and further. Not that I'm a misanthrope