Sustainability can be interpreted as the principle that practices in engineering have to be implemented with respect to constraints in energy and materials and waste minimization. Sustainable science and engineering will provide the basis to solutions to the changing environment. This book is about the matrix of solutions and actions that can be used to help humankind face the challenges of the changing world. This is not a traditional engineering text for engineering students, with worked examples and quantitative problems. Instead, it presents lots of global problems, which lends itself first to a conceptual solution, which may be followed by real practical solutions for implementation. For students, conceptual solutions may be required in the form of essays and presentations. This book is the reference for both engineers and non-engineers who want to participate fully in the betterment of the world.