Energy efficiency requires that we employ

A) only the lowest-cost energy inputs.
B) only domestic energy sources.
C) a mix of energy inputs, some of which are more expensive than others.
D) imported energy inputs and save domestic resources for future use.

Energy Efficiency

The practice of using less energy to provide the same service or achieve the same outcome, thereby reducing energy waste and increasing sustainability.

Energy Inputs

The amount of energy used to produce goods or services, an important factor in the efficiency and environmental impact of production processes.

Domestic Energy Sources

Various forms of energy production and resources found within a country's borders, including fossil fuels, renewables, and nuclear power.