The solution to that would be bigger than you think. I've wondered about about using solar to extract hydrogen from water or maybe a natural magnet motor-generator. (Even though the laws of physics say a perpetual motion machine isn't possible it doesn't some of us from trying to make one). In the natural world organic material is recycled. It would be difficult to copy that. I used to wonder if ambient RF could be havested...RFID demonstrates that energy levels are extremely low. You could try charging a super capacitor with a hand crank. Just about anything you fabricate will create some waste. Good luck.
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