Post Fukushima, there are rich opportunities in Japan for renewable energy and energy efficiency, yet without proper ethics humanity may stumble again. The book begins with Christ Centered Stewardship for the Environment. Then it shows the great opportunities particularly in Japan regarding full renewable energy supply. To begin sweeping in front of his own door, the author presents a feasibility study for wood gas co-generation at his university in suburban Tokyo. As for sustainable energy efficient architecture, Kaufmann Bausysteme GmbH (KBS) equipped a Social Center in Austria with cross laminated timber (CLT) modules. Not only the material fabric, the Social Center also excels with its consequent application of biographic care for the elderly, extra resilient in times of the corona virus. KBS is shown to be a world leader in sustainable architecture with a new module factory in Berlin, particularly for school buildings. Through the lens of Christ Centered Stewardship for the Environment, the book shows a series of most interesting real world examples of sustainable projects. It addresses everybody interested in a truly sustainable future. Foreword by Prof. Goro C. Kimura.