Green Business Model Innovation focuses on innovation in business models that decrease environmental impact. It includes life-cycle models like green supply chain management and take-back management, as well as functional sales models like selling a product's function as a service. Companies are embracing it due to rising resource prices, regulation, demanding customers, and investors. Case studies show positive financial and environmental results. Policies can promote it through funding, infrastructure development, and certification. Tools are also needed to help all companies work with green business model innovation.