This may come across as odd, but as far as largest, I would say electricity in general. When electricity first came around, fossil fuels were just one of many means to an end. There were electric cars at the beginning of the automobile era. Unfortunately the technology to store electric charge efficiently didn’t come around till later – so I may change my answer to that – batteries and capacitors – Previous methods of powering things were reliant on steam and burning of a variety of substances, it may not be realized yet – but electricity has the ability to be produced cleanly on a massive scale.
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