Infrastructure construction typically uses significant quantities of materials and natural resources. Thus, significant benefits are possible from the selection and use of more environmentally sustainable materials, including minimizing the use and consumption of natural resources (water, energy) and materials, decreasing potential negative impacts (reducing emissions, discharges, waste generation), recycling and reusing materials and wastes, and reducing project costs. For example, the use of recycled materials or more environmentally friendly cement, asphalt, and road base materials and materials to reduce dust generation or enhance slope erosion control and stabilization. The selection and use of materials relates to the project itself, but also to the production of materials and their transport to the project. Reducing our environmental impacts requires thinking and learning about not only how we use products, but where they came from and where they are going.