Explain the role of lifecycle assessment (LCA) in evaluating energy technologies.

• A. Lifecycle assessment is used only for cost accounting.
• B. Lifecycle assessment evaluates energy efficiency alone.
• C. Lifecycle assessment evaluates environmental impacts across a product's life cycle and enables comparisons of renewables vs fossil fuels on a common basis.
• D. Lifecycle assessment predicts market success.

Answer: (C)

Lifecycle assessment examines environmental burdens across the full life of an energy technology—from cradle to grave. By tracking inputs such as energy, materials, and water and outputs like emissions and waste at each stage—raw material extraction, manufacturing, transportation, operation, maintenance, and end-of-life disposal or recycling—LCA builds a complete picture of the technology’s environmental footprint. This uniform, cross-cutting framework lets us compare different energy options on a common basis, converting diverse impacts into comparable metrics (for example, CO2-equivalent emissions or total primary energy demand). It helps identify the stages with the largest burdens and informs design and policy choices to reduce overall environmental impact. LCA is not limited to cost accounting or to assessing energy efficiency alone, and it does not predict market success.