Integrity shown
Additionality: the project must show it with a test (ISO-ERW v1.2 §6.4, p. 1). CarbonMeld reads the test in the documents.CM-F-CDR-DAC-ERW-ADDITIONALITY
PURO-ERW — Enhanced Rock Weathering
About this methodology
Silicate rocks are crushed into fine particles, or residual rocks from other operations are used, and applied to soil, where their weathering removes carbon dioxide from the atmosphere.
- Issued by
- Puro.earth (PUR) · issuer's site
- Version
- 2025.2 · source ·
- Climate outcome
- CO2 removals
- Activity
- Enhanced weathering
- Official page
- puro.earth ·
How our current method reads projects of this type
Versions of the official text these rules cover: ISO-DAC v1.3, ISO-ERW* v1.0 / 1.1 / 1.2, Edition 2022 v.2 (Oct 2024)
What CarbonMeld reads
- shown
Grid emission factor: the methodology sets rules for it in some cases. CarbonMeld reads it in the project's documents.CM-F-CDR-DAC-ERW-GRID-EF
- shown
Durability of the storage: the methodology sets rules for it (ISO-DAC v1.3 summary, p. 1). CarbonMeld reads it in the project's documents.CM-F-CDR-DAC-ERW-DURABILITY-MEASUREMENT
- shown
Sustainability of the feedstock: the methodology sets rules for it in some cases. CarbonMeld reads it in the project's documents.CM-F-CDR-DAC-ERW-FEEDSTOCK-SUSTAINABILITY
Set by the methodology or the programme, not assessed by our current method
- not assessed
Leakage: the methodology sets rules for it (ISO-ERW v1.2 §8.5.4, p. 1). Our current method does not assess it.CM-F-CDR-DAC-ERW-LEAKAGE
- not assessed
Buffer pool: the methodology sets rules for it in some cases (ISO-ERW v1.2 §9.2, p. 1). Our current method does not assess it.CM-F-CDR-DAC-ERW-BUFFER
- not assessed
Permanence and reversals: the methodology sets rules for it (ISO-ERW v1.2 §9.2, p. 1). Our current method does not assess it.CM-F-CDR-DAC-ERW-PERMANENCE-REVERSAL
- not assessed
No legal requirement for the activity: the methodology sets rules for it (Puro ERW 2022 §3.2.2, p. 20). Our current method does not assess it.CM-F-CDR-DAC-ERW-REGULATORY-SURPLUS
- not assessed
Social safeguards and consent of communities (FPIC): any such rules come from the programme, not the methodology. Our current method does not assess it.CM-F-CDR-DAC-ERW-SAFEGUARDS-FPIC
Not applicable to this type — never a gap in our current method
The criterion does not apply to this methodology. Our current method never counts it as a gap.
- Fraction of non-renewable biomass (fNRB)CM-N-FNRB
- Usage rate of the devicesCM-N-USAGE
- Tracking of the end useCM-N-END-USE-TRACKING
Rules our current method does not apply
- Integrity deduction planned: not applied yet −1.5
Direct air capture: if the plant runs on fossil energy, CarbonMeld lowers integrity by 1.5.CM-G-DAC-FOSSIL-ENERGY
Our current method does not apply it. Some earlier (v2.1) analyses of DAC projects applied it.
- Claim safety deduction planned: not applied yet −1.0
Direct air capture: if the documents state no life-cycle assessment, CarbonMeld lowers claim safety by 1.0. It also shows a red flag.CM-G-DAC-NO-LCA
Our current method does not apply it.
- Integrity deduction planned: not applied yet −1.0
Direct air capture: if no independent body verifies the storage, CarbonMeld lowers integrity by 1.0.CM-G-DAC-STORAGE-NOT-VERIFIED
Our current method does not apply it.
The general rules apply as well. Read the general rules.
History and transitions
Top projects using PURO-ERW
This page ranks projects using PURO-ERW by their CarbonMeld document-based assessment scores. The rank compares project assessments; it is not a rating of the methodology itself.
5 rated projects of the 6 tracked in this methodology · average score 5.8/10 · ranked by CarbonMeld's document-based assessment scores across all four dimensions: integrity, transparency, claim safety and documentation.
5 analysed project pages, A–Z →
- 4 4.6 ▼ -0.2
- 5 3.6 ▼ -0.2