Green buildings are designed to reduce energy and resource consumption and minimize environmental impact. They include features like efficient lighting and HVAC systems, water saving technologies, and environmentally friendly materials. Green building certification systems have emerged to standardize best practices and quantify how environmentally sustainable a building is. The most well-known standard is LEED, which issues certifications at different levels based on points earned. Green buildings provide benefits like reduced operating costs, increased property values, and healthier indoor environments for occupants. To obtain LEED certification, projects register and document achievement of sustainability benchmarks over the course of construction.