Life Cycle Assessment Certified Professional (LCACP) · USA / international · American Center for Life Cycle Assessment
Original practice questions written to the published syllabus · not past papersQuantifying the environmental impacts of a product from cradle to grave under ISO 14040 and 14044: goal and scope, inventory, impact assessment and interpretation, with the agricultural complications of multifunctionality, land use and biogenic carbon.
In the exams: GATE ES Section 9 (life cycle assessment); ACLCA LCACP; sustainability analyst and PhD research roles
ACLCA Life Cycle Assessment Certified Professional (LCACP)
Practitioner depth across the whole manual: goal and scope requirements for comparative assertions, data quality and pedigree matrix, allocation and system expansion, attributional versus consequential modelling, LCIA method choice, uncertainty and Monte Carlo, critical review, EPDs and PCRs, and ethical reporting.
How our questions for Life Cycle Assessment Certified Professional spread across the units of Life Cycle Assessment. Difficulty: 15 easy, 67 medium, 19 hard.
| Agricultural LCA: field emissions models and databases | 13 | |
| Social LCA and life cycle costing | 10 | |
| Climate change, eutrophication, acidification, water and land-use categories | 9 | |
| Goal and scope: functional unit, system boundary, cut-off | 8 | |
| Allocation and system expansion for multifunctional processes | 8 | |
| Attributional versus consequential LCA | 8 | |
| Life cycle impact assessment methods and midpoint and endpoint indicators | 8 | |
| Biogenic carbon and land-use change in LCA | 8 | |
| Interpretation, sensitivity and uncertainty analysis | 8 | |
| Life cycle inventory: foreground and background data | 7 | |
| Carbon footprint of products (ISO 14067) and PEF | 7 | |
| Environmental product declarations and critical review | 6 | |
| Life cycle thinking and the ISO 14040/14044 framework | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
ISO 14044 lists three bases for cut-off criteria for deciding which inputs to include. Which set is correct?
A. Mass, energy and environmental significance
The three named criteria are mass, energy and environmental significance. Using mass alone can wrongly drop inputs that are tiny in mass but large in impact, such as pesticide active ingredients or high-GWP refrigerants. Cost, distance, shelf life and convenience are not cut-off criteria in the standard.
Further reading: ISO 14044:2006, 4.2.3.3
The pedigree matrix used to score LCI data quality assesses which set of indicators?
B. Reliability, completeness, temporal, geographical and further technological correlation
The pedigree matrix (Weidema and Wesnæs) scores each datum from 1 (best) to 5 on reliability, completeness, temporal, geographical and further technological correlation; the scores are converted to additional uncertainty. The other sets mix statistical terms, procurement criteria and cut-off criteria.
Further reading: Weidema and Wesnæs, J. Cleaner Production 1996
The three cultural perspectives of the ReCiPe method differ mainly in which respect?
A. Time horizon and which uncertain effects are included in the models
Individualist (short term, optimistic), hierarchist (consensus default) and egalitarian (long term, precautionary) perspectives use different time horizons and include or exclude uncertain effects. They are not about the normalisation country, the midpoint/endpoint split, or reporting precision.
Further reading: Hauschild et al., Life Cycle Assessment: Theory and Practice
A farm emits 20 kg NH3 and 5 kg NOx (as NO2). Using acidification factors of 1.88 kg SO2-eq/kg for NH3 and 0.70 for NO2, what is the acidification result?
B. 41.1 kg SO2-eq
Result = 20 × 1.88 + 5 × 0.70 = 37.6 + 3.5 = 41.1 kg SO2-eq. Adding masses gives 25.0; NH3 alone gives 37.6; dividing by the factors gives 17.8.
Further reading: Guinée (ed.), Handbook on LCA
In water footprinting within LCA, impact assessment of water scarcity is based on which inventory quantity?
B. Water consumption, the water not returned to the same catchment
Scarcity impact acts on consumption — water evaporated, incorporated or moved to another catchment — because returned water remains available. Withdrawal overstates the effect; grey and green water are volumetric concepts from water-resources footprinting rather than the basis of AWARE.
Further reading: ISO 14046:2014; Boulay et al. 2018
Under the '−1/+1' approach to biogenic carbon, how are uptake and release of biogenic CO2 characterised?
C. Uptake −1, release +1 kg CO2-eq per kg CO2
The −1/+1 approach makes the biogenic balance explicit: removals are negative and emissions positive, so storage or release as methane shows up. The zero-zero option is the 0/0 (carbon-neutral) convention; the other two reverse or omit flows.
Further reading: ISO 14067:2018
A farmer applies 1000 kg of limestone (CaCO3). With the IPCC Tier 1 factor of 0.12 t C per t limestone, what CO2 is emitted?
C. 440 kg CO2
C = 1000 × 0.12 = 120 kg; CO2 = 120 × 44/12 = 440 kg. 120 is carbon only; 477 uses the dolomite factor (0.13); 33 inverts the ratio.
Further reading: IPCC 2006 Guidelines Vol. 4 Ch. 11
Why is the 2006 IPCC Tier 1 direct N2O factor of 0.01 kg N2O-N per kg N a major source of uncertainty in crop LCAs?
A. Tenfold uncertainty range; N2O dominates many footprints
The IPCC gives a wide range (0.003–0.03 in the 2006 Guidelines) around the default because emissions depend on soil, climate and management; since N2O is often the largest farm GHG for crops, this uncertainty propagates strongly. It is a global default, applies to synthetic and organic N, and does not change annually.
Further reading: IPCC 2006 Guidelines Vol. 4 Ch. 11
Why does the PEF method use weighting to a single score although ISO 14044 bars weighting in public comparative assertions?
D. PEF is designed for comparability within product groups and fixes the weights in advance
PEF deliberately standardises choices, including normalisation and weighting factors, to make products within a category comparable; this departs from ISO 14044's approach for public comparisons. PEF results can be published, ISO did not mandate weighting, and PEF weights span all 16 categories.
Further reading: Commission Recommendation (EU) 2021/2279
Which LCA study does ISO 14044 require to undergo critical review by a panel of interested parties?
A. A study supporting a comparative assertion disclosed to the public
A public comparative assertion — a claim that a product is superior or equal to a competitor's — requires a panel review. Internal, single-product B2B and database studies may use lighter review or none.
Further reading: ISO 14044:2006, 6.3
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