Here we will define what makes a product green or sustainable. Having an understanding of third-party rating systems can help builders and designers be better-informed consumers and prevent buying into greenwashing. We will provide an overview of how to choose materials for a project, what to look for and how to determine sustainability. We will help you to understand green material specifications and how to include them in construction documents and LEED documentation. We will discusses embodied energy of virgin and recycled materials, and what this means to LEED projects.