Which statement best describes how energy efficiency reduces energy intensity?

• A. By lowering energy use per unit of GDP without harming services.
• B. By increasing total energy consumption.
• C. By eliminating all energy use.
• D. By only improving insulation of buildings but not industry.

Answer: (A)

Energy efficiency lowers energy intensity by letting the economy produce the same amount of goods and services with less energy. Energy intensity is the amount of energy used per unit of economic output (GDP). When efficiency improves—whether through better equipment, smarter processes, or better insulation—you achieve the same services with less energy, so energy intensity drops.

This is why the statement describing lowering energy use per unit of GDP without harming services is the best fit: it directly ties efficiency to a reduction in energy required for each unit of economic activity, while maintaining the level of service. The other ideas miss the core idea: increasing total energy use, eliminating all energy, or focusing only on one sector don’t capture how efficiency reduces energy needed per unit of output across the economy.