What does the term "energy efficiency" refer to?

The term "energy efficiency" is defined as using less energy to perform the same task or provide the same service. This concept emphasizes the ability to achieve the desired output while minimizing energy consumption, which contributes to reducing overall energy demand and environmental impact. Energy-efficient practices or technologies allow individuals and organizations to maintain productivity or comfort while utilizing fewer resources, resulting in cost savings and a decreased carbon footprint. This understanding of energy efficiency is crucial in the ongoing efforts to promote sustainable practices and conserve energy resources.

The other options do not accurately capture the essence of energy efficiency, as one suggests an increase in energy use for the same task, another implies equal energy use without reducing consumption, and the last focuses on renewable energy investments rather than the efficiency concept itself.