Voluntary carbon offset disclosures
Last updated: 4 November 2026 · Registry data read on 11 October 2026 (City Forest) and 4 November 2026 (Wakefield)
Crisp Labs LLC, doing business as Crisp Sky Society, markets and sells voluntary carbon offsets in California. This page lists every project we currently sell credits from, with the information California Health & Safety Code §44475 requires sellers to publish. We update it at least once a year and whenever we add or remove a project.
What we are, and what we are not. We are a reseller. We do not own or run any carbon project, and we do not issue or verify credits. We buy credits that a registry has already issued after independent verification, and we retire them, naming our customer as the beneficiary on the public retirement record where the registry or marketplace allows it. Every customer’s proof page names the exact project, registry record and retirement reference for the credits retired for them.
We only sell credits that a registry has already issued. Every credit we sell was issued for a past period, after verification. We do not sell forward or pre-issued credits.
Projects we sell credits from
Which project a customer receives depends on the plan and upgrade they choose:
- Included credits (every plan): urban forest preservation (City Forest Credits projects).
- Full biochar upgrade: biochar carbon removal (Wakefield Biochar Facility 2).
- 10% biochar blend: nine tonnes of included credits plus one tonne of biochar removal in every ten.
| Field | Buena Vista Heights Conservation Area | Harvey Manning Park Expansion | St. Elmo Preservation Project | Wakefield Biochar Facility 2 |
|---|---|---|---|---|
| Used for | Included credits | Included credits | Included credits | Full biochar upgrade and the biochar share of the 10% blend |
| Standard, registry and project ID | City Forest Credits, project 009. Credits are held and retired on Regen Registry, project C02-003. Project documents | City Forest Credits, project 015. Credits are held and retired on Regen Registry, project C02-004. Project documents | City Forest Credits, project 012 (listed there as “St. Elmo Forest Preservation”). Credits are held and retired on Regen Registry, project C02-006. Project documents | Puro Standard. Puro.earth registry, project 244045. Supplier: Accend AS. Operator: Wakefield Biochar. We buy and retire these credits through Carbonmark, where they are held as digital tokens linked to the Puro record (batch TCO2-PUR-244045-20240430, Base network). Each retirement is recorded on the Puro registry with the beneficiary named. |
| Project type: removal or avoidance | Forest preservation. Avoided emissions (avoided forest loss): 100% avoidance, no removal credits. | Forest preservation. Avoided emissions (avoided forest loss): 100% avoidance, no removal credits. | Forest preservation. Avoided emissions (avoided forest loss): 100% avoidance, no removal credits. | Biochar made from pine bark residues and stored in soils. Carbon removal: 100% removal, no avoidance credits. |
| Project site location | Elizabeth Township, Allegheny County, Pennsylvania, USA (about 124 acres) | Issaquah, King County, Washington, USA (about 15 acres) | St. Elmo neighbourhood, Chattanooga, Hamilton County, Tennessee, USA (about 58 acres) | Brunswick, Georgia, USA |
| Protocol / methodology | City Forest Credits Tree Preservation Protocol (40 years), version 8.40 | City Forest Credits Tree Preservation Protocol (40 years), version 10.40 | City Forest Credits Tree Preservation Protocol (40 years), version 9.40 | Puro.earth Biochar Methodology, edition 2022, under Puro Standard General Rules version 3.1 |
| Project start date and timeline | Started 30 June 2020 (deed restriction in effect). 40-year project term to 30 June 2060. Credits issued over the first three years. | Started 6 December 2021 (development restriction signed). 40-year project term to 6 December 2061. All credits issued in 2021. | Started 16 February 2021. 40-year project term to 16 February 2061; the recorded conservation restriction is stated as perpetual. Credits issued in 2021 and 2022. | Registered with Puro on 1 January 2021. Crediting period 1 January 2021 to 31 December 2025. Credits are issued for audited production periods. |
| Credit periods we sell, quantities issued, and anything modified or reversed | Regen batch C02-003-20200630-20220629-001 (credit period 30 June 2020 to 29 June 2022): 7,709 credits. Project total issued: 13,966 (5,635 in 2020; 5,635 in 2021; 2,696 in 2022). Reversals or cancellations recorded: none as of 11 October 2026. | Regen batch C02-004-20210102-20211207-001: 6,409 credits, which is the project total, all issued in 2021. (The registry dates the batch 2 January to 7 December 2021; the project itself started on 6 December 2021.) Reversals or cancellations recorded: none as of 11 October 2026. | Regen batch C02-006-20210216-20220215-001 (credit period 16 February 2021 to 15 February 2022): 8,714 credits on Regen. Project total issued by City Forest Credits: 10,127 (8,715 in 2021; 1,412 in 2022). Reversals or cancellations recorded: none as of 11 October 2026. | We sell credits from the 2024 vintage (batch TCO2-PUR-244045-20240430). Project total issued: 56,324 credits (registry, 4 November 2026). Correction recorded: for the production period 1 October 2023 to 31 December 2024, 19,455 credits were issued but the audit verified 14,059, because the operator changed how biochar quantity and carbon content are measured. Puro recovered the full 5,396-credit difference in November and December 2025: 277 unsold credits withdrawn from the supplier, 4,042 credits of the same type withdrawn from Wakefield Facilities 3 and 4, and 1,077 subtracted from the next issuance. Credits already sold to buyers were not withdrawn. Source: Puro withdrawal statement, 17 December 2025, on the registry page. |
| Emissions reduced or carbon removed per year | The protocol credits a one-time avoided loss, not a yearly flow: 13,966 t CO₂e in total after the reversal pool, issued over 2020 to 2022. | One-time avoided loss, not a yearly flow: 6,409 t CO₂e in total after the reversal pool, issued in 2021. | One-time avoided loss, not a yearly flow: 10,127 t CO₂e in total after the reversal pool, issued over 2021 and 2022. | Verified by audited production period: 1 January 2021 to 30 June 2022 at 0.88 t CO₂e per dry tonne of biochar; 1 October 2022 to 30 September 2023 at 0.741 t CO₂e per dry tonne; 14,059 t CO₂e (1 October 2023 to 31 December 2024, 15 months); 3,644 t CO₂e (1 January to 30 September 2025). The 2022 and 2023 audit statements give the removal rate per tonne of biochar, not a total; totals for those periods are in the full audit reports on the registry page. |
| Durability | 40-year preservation commitment under a recorded deed restriction, monitored for 40 years. Shorter than the atmospheric lifetime of CO₂. | 40-year preservation commitment under a recorded restriction, monitored for 40 years. Shorter than the atmospheric lifetime of CO₂. | 40-year minimum under the protocol, monitored for 40 years. Shorter than the atmospheric lifetime of CO₂. | Rated 100+ years under the Puro methodology (credit type CORC 100+). Shorter than the atmospheric lifetime of CO₂. |
| Standards the project meets | City Forest Credits standard (a nonprofit carbon registry), which is ICROA-endorsed. No ICVCM Core Carbon Principles label. | Same as Buena Vista Heights. | Same as Buena Vista Heights. | Puro Standard, which is ICROA-endorsed. No ICVCM Core Carbon Principles label. |
| Independent validation / verification | Yes. Ecofor LLC, verification report dated 10 September 2020. Operator monitoring reports since; the latest is dated September 2026. | Yes. Ecofor LLC, verification report dated 14 December 2021. Operator monitoring report 2024. | Yes. Ecofor LLC, verification report dated 30 March 2021. Operator monitoring report 2024. | Yes. EnergyLink Services Pty Ltd audits production for Puro.earth. Audits: January 2021 to June 2022 (statement dated 7 November 2022, which also confirmed the facility as eligible), October 2022 to September 2023 (19 December 2023), October 2023 to December 2024 (statement dated 4 November 2025) and January to September 2025 (report dated 17 December 2025), all with a positive conclusion at reasonable assurance. The 2025 audit raised one data-entry correction, which increased the verified total by 8.67 credits. |
Marketplaces label a batch by the year its credit period ends. The credit periods above are the registry’s own dates.
If a project does not deliver
If stored or protected carbon is reversed (for example a preserved forest is lost):
- City Forest Credits projects: 10% of each project’s credits are held in the standard’s Reversal Pool. Losses the operator could not avoid, such as fire, disease or storm, are covered from the pool. Losses the operator could have avoided must be replaced by the operator.
- Wakefield Biochar: Puro.earth has no buffer pool. Its methodology credits only the carbon expected to stay stored for 100 years or more. If an audit finds that too many credits were issued, Puro withdraws the excess or equivalent credits, as it did for this project in 2025 (see the table).
- What we do: if, within three years of the retirement date, a registry invalidates or reverses a credit we retired for a customer, we replace it with an equivalent credit at no cost and update the customer’s proof page. If no equivalent credit is reasonably available, we refund the share of the plan price for the affected tonnes. After three years we do not replace or refund (Terms of Service, section 5).
If future reductions do not materialise: we do not sell credits for future reductions. Every credit we sell has already been issued by its registry. Forest-preservation credits still depend on the forest staying protected for the 40-year term; that risk is covered by the Reversal Pool and by our replacement promise above. If we cannot retire credits for an order, we refund the unretired part in full.
Data and calculation methods
We do not calculate how many credits a project earns; the registry does, under the project’s protocol. The registries publish the documents behind each issuance: the protocol, the project design document with its calculations, the verification report and the monitoring reports are on each project’s page, linked in the table above. For Wakefield Biochar, the methodology, audit statements, audit reports and the withdrawal statement are on the Puro.earth project page.
How we estimate a customer’s footprint is a separate question, explained on our method page.
How we choose projects
- Credits already issued by a registry after independent, third-party verification.
- Projects in the United States first, then North America.
- Removal credits offered as an upgrade for customers who want carbon removed, not only emissions avoided.
- We do not list a project until we can complete every row of the table above from registry documents.
Changes to this list
We may add or substitute a project of the same credit type and equal or better durability if a project sells out or its price rises sharply (Terms of Service, section 5). This page is updated whenever the list changes, and each customer’s proof page always shows the project actually retired for them.
Crisp Labs LLC, doing business as Crisp Sky Society · 8840 San Ysidro Avenue #1002, Gilroy, CA 95020 · [email protected]. Project information comes from the registries named above; we check it at least once a year.