Which of the following practices is emphasized in LEED v4 for existing buildings?

In LEED v4 for existing buildings, incorporating green cleaning policies is emphasized as a best practice. This approach focuses on improving indoor environmental quality and occupant health by using cleaning products and methods that are safer for both human health and the environment. Green cleaning policies help reduce the presence of harmful chemicals in the indoor space, minimizing health risks associated with poor indoor air quality.

The adoption of these policies is important for existing buildings, where the existing conditions may have previously contributed to subpar indoor environmental quality. By implementing green cleaning practices, organizations can promote sustainability and enhance the overall well-being of occupants while also supporting waste reduction and minimizing the impact on water resources.

Other options, such as using more fossil fuels, restricting energy-efficient systems, or promoting higher water usage, do not align with the objectives of LEED certification, which aims to encourage energy efficiency, reduce reliance on fossil fuels, and promote sustainable water management practices.