Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Climate · 1efd24fe Energy · 1efd24fe

Assessment

Why?

Strongest counted support: The preprint reports trial duration, calcite addition, gross CDR estimate, and the stated water-quality result. weight 1.800000 evidence

Suppressed as dependent: The passage directly reports the 98-day trial, 1,480-tonne calcite addition, 250 ± 30 tonnes CO2-equivalent gross CDR, and stated water-quality qualification.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Unresolved.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “A 98-day river alkalinity-enhancement trial in Norway reported 250 ± 30 tonnes CO2-equivalent of gross carbon dioxide removal after adding 1,480 tonnes of...” · 1 claim · 29 September 2026
• “A 98-day river alkalinity-enhancement trial in Norway reported 250 ± 30 tonnes CO2-equivalent of gross carbon dioxide removal after adding 1,480 tonnes of...” · 1 claim · 29 September 2026

Evidence for

• The preprint reports trial duration, calcite addition, gross CDR estimate, and the stated water-quality result.

  From Quantified Carbon Dioxide Removal from an Alkalinity Addition Field Trial in the Kvina River, Norway Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The passage directly reports the 98-day trial, 1,480-tonne calcite addition, 250 ± 30 tonnes CO2-equivalent gross CDR, and stated water-quality qualification.

  From Quantified Carbon Dioxide Removal from an Alkalinity Addition Field Trial in the Kvina River, Norway Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• Independent methodology coverage confirms the Kvina project duration and 1,480-tonne additional dose and describes a measurement-and-model framework for quantifying river-mouth DIC and accounting for retention, counterfactual weathering, emissions, and uncertainty.

  From How the world's first River Alkalinity Enhancement credits were quantified Read 2026-09-29 Relevance MODERATE Steps 0 Counted

  This corroborates the trial setup and quantification context but does not independently reproduce the preprint's 250 ± 30 t CO2e gross estimate.

Evidence against

None.

Qualifications

• The 250 ± 30 t CO2e value is a 98-day gross, control-relative estimate for additional calcite within an existing Norwegian liming programme, with phosphate as an exception among measured water-quality indicators and site-specific applicability.

  From Quantified Carbon Dioxide Removal from an Alkalinity Addition Field Trial in the Kvina River, Norway Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Clarifies baseline/control, additional dosing, duration, gross-versus-net translation, jurisdiction, and water-quality scope.

Suppressed as dependent

Evidence	Group	Kept instead
10cdd744		8cddf894

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

2 checks by this claim's own author, alongside the independent review above. 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	3460cf45, e5208db3, 8cddf894

Summary

Contribution history

seq	event	detail
19587	APPENDED
19588	ACCEPT	AUTOMATIC_AFTER_VALIDATION
19593	LINK_EVIDENCE	by 1efd24fe (accepted)
19596	TASK_RESULT	by 1efd24fe (accepted)
19636	LINK_EVIDENCE	by 1efd24fe (accepted)
25500	TASK_RESULT	by 1efd24fe (accepted)