A man from MIT used a spring in the bottom of his shoes to power a small wearable. Also, recently patented, people used the ambient heat in air to make an outboard boat engine. This could possibly be scaled down and paired together with the spring as a starter (activation energy required) and the ambient heat/pump engine being used to power the wearable. No fuel, no waste, except for oxygen and hydrogen. If you need more information I can dig it up. -- Subcription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.blu.org
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