System boundaries are crucial for Life Cycle Assessments (LCA). They define what processes and stages across a product's life cycle are considered in the assessment and which are not. Think of it like knowing the breakdown of the total cost of a product, such as delivery fees and taxes. Without this complete picture, it’s hard to understand the true cost.
In LCAs, clearly defined system boundaries help reduce uncertainty. Most methodologies and standards require these boundaries to be explicitly stated in reports. However, misunderstandings can still arise if the boundaries aren’t clearly communicated, similar to how unexpected fees can surprise online shoppers.
Sometimes, studies set narrow system boundaries to focus on specific aspects. For instance, a food producer might compare two types of plastic for bottles, assuming other factors like ingredients and shelf life remain constant. This makes it easier to understand the impact of the plastic alone. While it’s easy to mistake this for a comprehensive assessment of the entire product lifecycle, it’s important to not view the relative reduction of a specific aspect, as the relative reduction of the whole.
Consider an analogy: if one product is £1 and another is £2, but both have a £10 delivery fee, the price difference is much smaller when you include the fee. Similarly, LCA results can be misleading if the system boundaries don’t account for the entire lifecycle. Other studies might omit the use phase of a product, which can bias the results.
Products that shift final production steps to consumers might appear more environmentally friendly than they are, if the use phase is not within the system boundaries. Always check the system boundaries when comparing the outcomes of LCA studies.
The EU’s Product Environmental Footprint (PEF) methodology sets comprehensive standards for LCA system boundaries:
"The system boundary shall be defined following a general supply-chain logic, including all stages from raw material acquisition and pre-processing, production of the main product, product distribution and storage, use stage and end of life treatment of the product (if appropriate)."
It includes all stages from raw material acquisition to end-of-life treatment, ensuring a holistic view. However, some exclusions are standardised, such as for intermediate products like B2B apple juice concentrate, which is sold upstream to be used as part of a consumer product, where the use and end-of-life stages are excluded.
The thinking there is, that these will be covered in the final product’s LCA and this way, the intermediate products calculated impact can directly be plugged into the latter’s assessment, to avoid double counting. The important aspect here is, that the final product still covers the whole lifecycle including that of the intermediate products’ sourcing and manufacturing while a manufacturer has information about the ingredients they purchase.
While the System Boundaries also define what to consider along the path of a product’s life, a terminology and concept that people are more and more familiar with is that of start-to-end point of an assessment. Common terms include:
System boundaries are fundamental to LCAs, defining the scope and influencing the results. Misunderstandings can occur if these boundaries aren’t clear, but standardised frameworks like PEF help mitigate this.
At Sustained aim provide clear and understandable reports using PEF, you can find out more about why we use PEF in this blog. If you'd like to test automated LCA for your one your products, sign up for a free 2 week trial.