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Emissions assessed across the stated stages of a product’s life, such as extraction, transport and use, rather than at only one stage.
Save conceptLife-cycle emissions describe an assessment that covers the stated stages of a product’s life rather than only a single activity. For a fuel, the boundary may include extraction, transport and consumption. The term is useful only when the included stages and measurement basis are clear enough to understand what the calculation compares.
The calculation brings emissions from the included stages onto a common basis and combines them. A comparison then applies the same scope to the alternatives or identifies the relevant differences. The final total can change because of one stage even when other stages are the same. The reference period and the supply mix also affect the comparison.
Imagine two hypothetical fuel supplies with equal emissions when consumed but different emissions from production and transport. Adding the included stages can give one supply a lower total life-cycle footprint, even though the user’s combustion emissions are unchanged. This example explains the distinction; it supplies no actual emissions values and does not independently verify a company’s claimed advantage.
A lower life-cycle footprint does not make a fuel emissions-free. Nor does it prove that every stage has improved. A reader needs to know the comparison basis and where the difference arises. Documented origin, a contractual supply commitment and an emissions calculation are related information, but they answer different questions about the product.
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