The book is intended as a primary resource for Chief Sustainability Officers (CSOs), all professionals with interest in sustainability as well as sustainability courses at CBS International Business School and other universities. It starts by reviewing the challenges of sustainability (environmental, social, economic, and governance). The basics of life cycle thinking are explained, looking at Life Cycle Assessment/LCA, Life Cycle Costing/LCC, Social LCAs, and Life Cycle Management. These are applied to sustainable strategy development, sustainable product development, sustainable supply chain management and logistics, sustainable production, sustainable consumption, circular economy, sustainable digitalization, sustainable finance, sustainable employee relations, sustainable advocacy, law and policymaking, etc. -to show how each person in each profession and role can act sustainably and how to democratize sustainability.