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Originally Posted by DeafPenPal
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Magnet: You mean magnetic levitation like maglev trains? Those involve electromagnets that require energy unless you use permanent magnets like in the Inductrack system. They'd all need additional energy for horizontal motion.
Air: The air compressor would need energy to compress the air.
Water: The water would need energy to be split up into hydrogen and oxygen.
Batteries: Those need energy to be charged up.
The clean way of using those is to use renewable energy sources.
The are working on using plants we can't eat, including those that don't need to be grown on good farmland, and parts of edible plants we don't eat, like the stalks of corn plants.