This Chapter contains the concept of ideal technology and its realization opportunity using nanotechnology, opportunities & challenges for green technology in 21stcentury, concept of ideal water purifier system to produce potable water and its realization opportunities using nanotechnology, and nanotechnological innovations & business environment for automobile sector : a futuristic approach, nanotechnology innovations & business opportunities in renewable energy sector, concept & characteristics of the ideal energy system and its realization constraints, realization opportunity of ideal energy system using nanotechnology based research and innovations and the concept of ideal drug &its realization opportunity using present pharmaceutical sciences scenario.