Kerosene
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Engineers have demonstrated a pilot system that produces fuels from sunlight and air. The device captures carbon dioxide and water from the air and uses solar energy to convert it into syngas, which is then converted into carbon-neutral liquid fuels.
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ScienceUsing jet propellent and a combination of enzymes as catalysts, researchers at the University of Utah have produced a prototype fuel cell that runs at room temperature and without the need to ignite the fuel.