In this study, optimum solutions and action plans for sustainable energy development are discussed. Reduction of CO2 emission could be realized with increasing nuclear and renewable energy usage, and efficiencies on fuel, power, electricity, and fossil fuels. In here, "ecosystems approach" is vital importance. Worldwide cooperation is the most important with the concepts of 6 Cs (credibility, capability, continuity, creativity, consistency, and commitment). Therefore, it can be successfully developed on sustainability, sharing with public, strategy and culture, procedures and evaluation together with 6 Cs.