Fuente: WIPO "tomato" A circulation system includes a biomass generator for supplying electricity to a specific facility, a first air conditioner for performing air conditioning of the specific facility based on waste heat generated by use of the fuel in the biomass generator, a second air conditioner for performing air conditioning of an agricultural house that cultivates plants based on the waste heat generated by use of the fuel in the biomass generator, a first supply structure for supplying generated power by the biomass generator to at least one of equipment in the agricultural house and the second air conditioner, and a second supply structure for supplying carbon dioxide generated by use of the fuel in the biomass generator to the agricultural house. The agricultural house grows wood for obtaining the wood material available as the fuel in the biomass generator.