1. The following data were used: Primary energy in Japan (2013): 21,973 PJ (Agency for Natural Resources and Energy, METI, Japan), Solar energy at Tokyo: 5.07×1015J/km2/year (Atmospheric Science Data Center, NASA, USA), Generated energy using a solar battery (efficiency 15%): 760×1012J/km2/year, Required area for producing energy for Japan: 28,900km2, Land area of Japan: 377,962km2 (Statistics Japan, MIC, Japan).
2. The following data were used: Primary energy in the world (2013): 535,000PJ (BP Statistical Review of World Energy June 2014), Solar energy at Sahara Desert: 7.77×1015J/km2/year (Atmospheric Science Data Center, NASA, USA), Generated energy using a solar battery (efficiency 15%): 1170×1012J/km2/year, Required area for producing energy for the world: 459,000km2, Land area of Sahara Desert: 10,000,000km2.
3. Photoelectrocatalytic reduction of carbon dioxide in aqueous suspensions of semiconductor powders
4. Efficient photochemical reduction of CO2to CO by visible light irradiation of systems containing Re(bipy)(CO)3X or Ru(bipy)32+–Co2+combinations as homogeneous catalysts
5. Photochemical and Electrochemical Reduction of Carbon Dioxide to Carbon Monoxide Mediated by (2,2?-Bipyridine)tricarbonylchlororhenium(I) and Related Complexes as Homogeneous Catalysts