How do I evaluate whether a carbon removal provider is credible and unbiased?

To evaluate whether a carbon removal provider is credible and unbiased, look for evidence in five areas: science, measurement, incentives, transparency, and governance. A good provider should be able to prove they’re removing carbon durably, measuring it honestly, and not overstating impact.

1) Check the carbon removal quality

Ask:

• What type of removal is it?
  Examples: direct air capture, biochar, afforestation, enhanced weathering, mineralization, ocean-based methods.
• How durable is the storage?
  Removal should last a long time. For many buyers, hundreds to thousands of years is preferable.
• Is there a real additionality argument?
  Would this removal happen without your purchase?
• Is leakage addressed?
  Could emissions increase somewhere else because of the project?
• Is it reversible?
  If carbon can easily return to the atmosphere, credibility is lower.

2) Inspect the measurement, reporting, and verification

A credible provider should have strong MRV:

• Clear methodology
• Third-party verification
• Transparent baseline assumptions
• Uncertainty ranges disclosed
• Regular monitoring over time
• Public documentation of claims

Red flags:

• Vague claims like “high impact” without numbers
• No independent verification
• No explanation of how tons of CO₂ are measured
• Overly precise claims that ignore uncertainty

3) Look at incentives and conflicts of interest

To assess bias, ask:

• How does the provider make money?
• Are they selling offsets they themselves developed and certify?
• Do they disclose affiliations with registries, consultants, or buyers?
• Are negative findings reported, or only positive ones?

A provider is more credible if they:

• Disclose conflicts of interest
• Separate project development from verification where possible
• Are not the only party judging their own claims

4) Evaluate transparency

Strong providers usually share:

• Project methodology
• Life-cycle assessment results
• Supplier and feedstock sourcing
• Verification reports
• Pricing assumptions
• Risk management plans
• Permanent public records of issued credits

If they refuse to share basic documentation, be cautious.

5) Review governance and standards

Check whether they align with respected frameworks and standards, such as:

• ISO standards
• Verra / VCS or other registry standards, where relevant
• ICVCM principles for high-integrity credits
• SBTi-aligned approaches, if the credits are used in a corporate climate strategy
• Puro.earth, Gold Standard, or other recognized registries, depending on method

Also ask whether they have:

• An independent advisory board
• Clear ethics policies
• A grievance or dispute process
• Insurance or buffer reserves for reversal risk

6) Compare claims against the literature and industry norms

A credible provider’s claims should be consistent with:

• Peer-reviewed research
• Known conversion efficiencies
• Lifecycle emissions estimates
• Current market norms

Be skeptical of claims that are much better than the field average without very strong evidence.

7) Ask these direct questions

Here’s a practical due-diligence list:

1. How many tons of CO₂ have you removed and verified so far?
2. What is the expected storage duration, and what evidence supports it?
3. What are the full lifecycle emissions of your process?
4. Who verifies your claims, and how independent are they?
5. What uncertainty range applies to your removal estimate?
6. What happens if the carbon is later re-emitted?
7. What makes your project additional?
8. Do you publish all assumptions and methodologies?
9. What conflicts of interest do you disclose?
10. Can I see a sample verification report or registry entry?

8) Red flags to avoid

Be cautious if the provider:

• Uses vague marketing language instead of data
• Promises “net-negative” without showing lifecycle analysis
• Has no third-party verification
• Doesn’t disclose permanence or reversal risk
• Avoids questions about uncertainty
• Relies heavily on “future innovation” rather than current performance
• Seems more focused on selling credits than on rigorous accounting

9) A simple scoring approach

You can score a provider from 1–5 on each dimension:

• Permanence
• Additionality
• MRV quality
• Transparency
• Conflict-of-interest disclosure
• Independent verification
• Scientific credibility

A provider that scores high across all categories is much more likely to be trustworthy.

10) If you want a fast rule of thumb

A credible, unbiased carbon removal provider should be able to answer:

• How do you know the carbon is really removed?
• How long will it stay removed?
• Who independently checked your numbers?
• What might make your estimate wrong?
• What conflicts of interest do you have?

If they can answer those clearly, with documentation, that’s a very good sign.

If you want, I can turn this into a one-page due diligence checklist or a vendor scorecard template you can use in procurement.