Green building rating systems are standardized programs that assess and certify the environmental performance and sustainability of buildings, providing a framework for design, construction, and operation of high-performance, green buildings. 

Here's a breakdown of what they are and some examples:

What they are:

• Tools for Assessment:

  These systems offer a structured approach to evaluating building projects based on various environmental criteria, such as energy efficiency, water usage, material selection, and indoor environmental quality. 

• Framework for Sustainability:

  They provide a framework for designers, builders, and owners to incorporate sustainable practices into their projects. 

• Certification and Recognition:

  Successful projects that meet the criteria of a specific rating system can earn certification, which demonstrates their commitment to sustainability and can enhance their marketability and value. 

• Industry Standards:

  Many rating systems have become widely recognized as industry standards, influencing design choices and construction practices. 

Examples of Green Building Rating Systems:

• LEED (Leadership in Energy and Environmental Design):

  Developed by the U.S. Green Building Council (USGBC), LEED is a widely recognized system for evaluating the environmental performance of buildings. 

• WELL Building Standard:

  Focuses on human health and well-being within buildings, assessing factors like air quality, light, sound, water, materials, and thermal comfort. 

• Green Star:

  An international sustainability reporting and rating system, particularly popular in Australia and South Africa. 

• Living Building Challenge:

  A rigorous system that promotes restorative design and aims for buildings to be net-zero energy and water. 

• Energy Star:

  A rating system created by the U.S. EPA and DOE that uses a benchmarking method to assess a building's energy and water use. 

• CASBEE (Comprehensive Assessment System for Built Environment Efficiency):

  A green building certification in Japan, though it's currently being piloted for international use. 

• BCA Green Mark:

  A rating system of the Building and Construction Authority of Singapore to evaluate the environmental friendliness of infrastructure assets.