What does LEED recognize as an effective measure for reducing both energy and water use?

Implementing high-efficiency plumbing fixtures and appliances is recognized by LEED as an effective measure for reducing both energy and water use because these fixtures and appliances are designed to consume significantly less water than standard models while maintaining performance. This results in reduced water consumption, which directly lowers the energy required for water heating and distribution.

By selecting high-efficiency options, buildings can achieve substantial savings in both water and energy bills, contributing to overall sustainability goals. Such practices align with LEED's commitment to conserving resources and promoting environmentally responsible building practices.

The other options do not contribute effectively to the reduction of energy and water use. Relying exclusively on natural water sources can lead to depletion of those resources and does not ensure conservation through efficiency. Using only conventional energy sources does not address energy reduction or sustainability, as these sources tend to be less efficient and more polluting. Lastly, eliminating insulation would likely increase energy use due to higher heating and cooling demands, negating any potential savings from other measures.