Picking up where Factor Four left off, this new book examines the past 15 years of innovation in industry, technical innovation and policy. It shows how and where factor four gains have been made and how we can achieve greater factor five or 80%+ improvements in resource and energy productivity. The book tackles sustainable development and climate change, energy productivity, the built environment, transport and industry, material productivity including steel, concrete and timber, chemistry, engineering, water efficiency and sustainable agriculture.