Sustainable humanosphere with energy from space

Humanospheric science is very important for human future. Humanospheric science is defined as an interdisciplinary science to conduct research concerning the humanosphere. To maintain human welfare and current living standards, or even to avoid perishing disaster during this century, issues on energy, food and the environment should be seriously discussed and solved. The increasing demand for electricity, on the other hand, conflicts with the demand for clean environment due to fossil-based power plants. Electricity has been generated by several ways, such as hydroelectric power, fossil thermal power and atomic power. However, some of them are the causes of environmental and pollution issues over the globe. Under these circumstances, research has been carried out to look into the possibility of building a power station in space and transmitting electricity generated in space to Earth by way of radio waves. A space solar power system (SSPS), combined with microwave power transmission (MPT), is a most important system and technology for the humanosphere in future. From the 1980s, MPT and SPS have been studied in Kyoto University. We show some MPT experimental results in Kyoto University and show the prospective future in the world.