Value chain · CLM-0816
In plain terms
In their 2020 study of the 1978 NASA/DOE design, the authors list their own weak points: only whole-system detail rather than part-by-part, a background database built mainly on European data and patched with substitutes, social impacts assessed only for supply-chain actors and workers because organisations would not share data, and seven impact categories that lacked weighting factors and could not be checked against any global or planetary-limit yardstick because none had then been defined for them.
The claim as recorded
The paper's stated study limitations are that results are generic system-level only because subsystem data could not be obtained from the reference programme documents; that the Strathclyde Space Systems Database has a mainly European focus and, where data was missing or unsuitable for the United States or this system, the authors substituted a global perspective, new literature-based datasets, or forced proxy and comparable-alternative datasets; that social impacts model only the value-chain-actor and worker stakeholder categories because organisations were unwilling to contribute data, with stakeholder risk values altered to reflect this; and that normalisation and weighting factors and AGIs and PBs are not available for seven impact categories, so potentially meaningful impacts in those categories may be overlooked.
Scope and limits
This records the paper's own disclosed scope limits and must be used to qualify, never to dismiss, every other claim drawn from this source. In particular, any ranking of this paper's ozone result at CLM-0812 against its mineral-depletion or human-toxicity results must state that eight of the paper's 18 impact categories have no AGI or PB value in this source (the seven that s3.3 lists, and mineral resource depletion, which s5.3 on p11 also names as excluded), so relative severity across all categories cannot be ranked from it.
What it assumes
No assumptions are recorded against this claim.
Where it comes from
p6 s3.3, non-contiguous excerpts in source order: "Firstly, the analysis is only capable of providing generic system-level results since highly detailed subsystem data could not be obtained from the CDEP documents for the purposes of this study..." ... "some datasets had to forcibly be represented through proxies or comparable alternatives..." ... "only the stakeholder categories of value chain actors and workers are currently modelled due to a lack of data..." ... "the normalisation & weighting factors and AGIs & PBs are not currently available for all impact categories... The affected impact categories are CRMDP, TCED, IRP, PMFP, FRDP, HTP and METP (see Table 5)."
Related records
- Answers question
- QST-008 not published in this release
Cite this
energyaperture.com/c/clm-0816
CLM-0816, Energy Aperture, as of 2020.
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-212
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