Abstract
Purpose
To clarify the concept of the amortization period (20-year factor) associated with direct land-use change (dLUC) accounting, discuss its main inconsistencies, and propose improvements. The current practice is to divide (amortize) the estimated emissions associated with dLUC that has occurred over the last 20 years by another 20 years. Both periods are referred ambiguously as “amortization period.” Issues arise when considering them as a single temporal aspect (TA) that cannot fully represent the complexity of diverse research and policy contexts.
Methods
First, a systematic review was conducted to understand the 20-year amortization history and concepts and discuss its inconsistencies. Based on the review results, we propose the adoption of two distinct TAs, decomposed from the “amortization period.” Then, we performed a sensitivity analysis by estimating carbon emissions due to dLUC in six land uses in Brazil: soybean, maize, sugarcane, pasture, planted forest, and mango.
Results and discussion
The literature review shows that several strategies have emerged to reduce or avoid adopting the amortization period. However, most of these proposals are based on complex approaches focusing on alternatives associated with the life cycle impact assessment stage. We found that the commonly adopted amortization period has an ambiguous nature that could be explored at the life cycle inventory analysis stage. Thus, we argue that there are two distinct TAs linked to amortization in dLUC: (i) the inventory period adopted to account for land-use changes; and (ii) the period over which carbon emissions are annualized. These temporal aspects were named here the “LUC-inventory period” (IP) and the “LUC-amortization period” (AP), for clarification purposes. The sensitivity analysis showed that different values of IP and AP drastically change the emissions results due to dLUC in Brazil for different crops and land uses.
Conclusion
We advocate that the “amortization period” should be decomposed into two TAs: “LUC-inventory period” and the “LUC-amortization period.” They affect how the carbon debt incurred by expanding agricultural land is accounted for and amortized over a given period-of-time. Therefore, to ensure regulatory compliance, we argued that these proposed TAs should be explicitly defined, based on three possibilities, depending on the goal and context of LCA studies, such as (i) fixed values set in standards and norms; (ii) IPCC’s 20-year defaults; and (iii) customized IP and AP values based on the study’s specificities.
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Data availability
The authors confirm that the data supporting the findings of this study are available within the article and its Supplementary materials. Raw data supporting this study’s findings are available from the corresponding authors upon reasonable request.
Abbreviations
- AP:
-
LUC-amortization period
- C:
-
Carbon
- CRF:
-
Cumulative radiative forcing
- GHG:
-
Greenhouse gas
- GWP:
-
Global warming potential
- IBGE:
-
Brazilian Institute of Geography and Statistics
- IP:
-
LUC-inventory period
- LCA:
-
Life cycle assessment
- LCI:
-
Life cycle inventory
- LCIA:
-
Life cycle impact assessment
- LUC:
-
Land-use change
- dLUC:
-
Direct land-use change
- iLUC:
-
Indirect land-use change
- NDCs:
-
Nationally Determined Contributions
- SDGs:
-
Sustainable Development Goals
- SR:
-
Systematic literature review
- TA:
-
Temporal aspect
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Acknowledgements
The authors are grateful to PhD. Professor Marcus Seferin (PUC-RS), PhD. Luis Barioni (Embrapa), and PhD. Rodrigo Alvarenga (Ghent University) for their comments on early versions of the manuscript, as well as to PhD. Bruno Alves (Embrapa) and PhD. Marcelo Moreira (Agroicone) for their comments on the history of amortization period definitions.
Funding
This research was funded by Embrapa project number 30.20.90.004.00.00, which granted research scholarships to V.M and D.G. The project was co-funded with public resources provided by the Brazilian Agricultural Research Corporation (Embrapa), and private resources provided by four industry associations: the Brazilian Feed Industry Association (Sindirações), the Brazilian Animal Protein Association (ABPA), the Brazilian Association of Vegetable Oil Industries (Abiove), and the Brazilian Association of Soybean Producers (Aprosoja).
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The authors declare that there was a potential conflict of interest of industry associations, which was addressed through the following measures: open call for scholarship candidates and selection by the Embrapa team; submitting previous hypotheses, methods and results to scrutiny by independent specialized researchers; submitting the manuscript to a peer-review journal, and not involving the associations in the discussion about the results.
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Maciel, V.G., Novaes, R.M.L., Brandão, M. et al. Towards a non-ambiguous view of the amortization period for quantifying direct land-use change in LCA. Int J Life Cycle Assess 27, 1299–1315 (2022). https://doi.org/10.1007/s11367-022-02103-3
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DOI: https://doi.org/10.1007/s11367-022-02103-3