This book chapter addresses goals 11, 12, and 15 by showing that human population growth is not the only matter for consideration in ecological engineering. What matters for the future is not only how many people there will be, but what they will do in their everyday life; this will impact the life systems surrounding them and how equipped they will be to face emerging challenges. In coming decades, the survival and well-being of humans and the security of environmental resources will continue to be challenged by rapid population growth.