{HEAD ~ A methane or methanol producing system} is proposed in which laser beams are generated in space by {TAIL ~ excitation} of sunlight, transmitted onto land or sea without loss to obtain optical energy with high efficiency, and irradiated on a hydrogen producing device to produce industrially inexpensive hydrogen with high efficiency, thereby producing methane or methanol 
{ HEAD ~ A methane or methanol producing system } is proposed in which laser beams are generated in space by { TAIL ~ excitation } of sunlight , transmitted onto land or sea without loss to obtain optical energy with high efficiency , and irradiated on a hydrogen producing device to produce industrially inexpensive hydrogen with high efficiency , thereby producing methane or methanol
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