Effective electrodes for electrolysis of seawater for production of hydrogen (H
2) without releasing chlorine into atmosphere and catalysts for production of methane (CH
4) by the reaction of carbon dioxide (CO
2) with H
2 have been tailored. Using these novel materials a CO
2 recycling plant for substantiation of our proposal has been built on the roof of Institute for Materials Research, Tohoku University. The CO
2 recycling plant consists of a desert, a coast close to the desert and an energy consuming district. At the desert electricity is generated by solar cell operation and transmitted to the coast close to the desert. At the coast H
2 is produced by electrolysis of seawater using the electricity, and then CH
4 is formed by the reaction of H
2 and CO
2. CH
4 is transported to the energy consuming district. At the energy consuming district combustion of CH
4 is carried out not by air but by O
2 and CO
2 is recovered after removing H
2O from the exhaust gas composed only of CO
2 and H
2O. The recovered CO
2 is sent again to the coast close to the desert for reproduction of CH
4. The CO
2 recycling plant has substantiated that the solar energy at the desert can be used by energy consumers in the form of CH
4 without emitting CO
2 into atmosphere.
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