Our problems : Increasing worldwide population. Huge deserts and progression of the desert : Asia, Africa, South America, Australia, Siberia. Too much water (75% of Earth surface + poles) : erosion, flood, melting poles which rain above us. Fewer and fewer land for farming (cities, erosion), natural hazards. My solutions : Construction Boats which could navigate in the ocean and rivers worldwide. Containing machines to build : Farming Building : Each floor dedicated to farming. Minimum use if soil. Control of light, humidity. Eventually ground floor for commercial area or transport facilities. Underground with parking and water tanks (from rain) Automatic harvest. Maximize natural resources : water tank underground (filled with rain), optimize sun exposition, optimize natural air circulation. Produce energy locally : solar power or other local underground heat. Heating / light : use optimal air circulation (machine/human/sun heat) + optimal selection of plants for each floor (sun exposition), to produce bigger fruits/vegetables. Opportunities : Multiply farming area by ... the number of floors. Multiply the number of trees (several floors) -> reducing pollution/storing CO2. Exportation (the plans, construction management, IT, engineering, some hardware for automatic harvest/building operations...) Use low cost and local staff : construction phase, exploitation, commercialize local production. Give work and food to local people : construction phase, production, sell food, maintenance, ... Production not depending on nature : floods, diseases, drought, cold, insects. Farming building could be located inside towns : reduce gaz use (transportation), fresh fruits & vegetables, lower production/transport costs.