Scientists and industry clash over GHG Protocol forest carbon rules
Senior scientist leaves World Resources Institute over forest carbon dispute
A technical argument over forest carbon accounting has escalated into a public dispute about governance inside the Greenhouse Gas Protocol. Tim Searchinger, a senior research scholar at Princeton University and technical director for land issues at the World Resources Institute, resigned from his WRI role in August 2026. His departure followed months of conflict over whether companies should be allowed to count forest harvests and wood consumption as carbon removals in their climate reporting.
The disagreement centres on a question with significant commercial implications. Should managed forests be credited broadly for carbon absorbed over time, or should removals be tied strictly to additional human-driven sequestration? The answer could materially change how timber, paper, packaging, and other forest-linked products appear in corporate carbon footprints. For businesses in these sectors, the difference affects reported emissions, investor perception, and procurement decisions.
The Greenhouse Gas Protocol provides the dominant framework companies use to measure and report greenhouse gas emissions. Consequently, its rules shape how corporate climate claims are calculated, compared, and verified. The organization has been developing land-sector guidance for several years. However, the process has now become mired in accusations that industry voices have gained excessive influence over scientific standards.
Danny Cullenward, a forest carbon expert, resigned from the Protocol's Independent Standards Board in June 2026. He accused the body of violating its own rules and effectively delegating standards-setting to what he described as a secret, industry-led working group. His resignation came two months before Searchinger's departure, signaling growing frustration among scientists involved in the process.
Forest accounting remains unresolved in January 2026 standard
The GHG Protocol released its Land Sector and Removals Standard on 30 January 2026. The standard is scheduled to take effect on 1 January 2027. Notably, it does not settle forest carbon accounting. According to the published summary, forestry was explicitly left out because more time was needed to balance scientific accuracy with practical feasibility.
Companies that choose to disclose forest carbon impacts in the interim are expected to be transparent about the methodology they use. This leaves businesses with discretion over their approach, but also exposes them to scrutiny. Without a settled methodology, claims about forest-related carbon benefits will face questions about whether they reflect real atmospheric outcomes or favourable accounting choices.
The postponement reflects deep divisions within the standards-setting process. Internal documents reported by SourceMaterial showed a split between industry representatives and scientists. Companies including IKEA and Weyerhaeuser were involved in working groups alongside academic researchers. The process descended into what was described as a pitched battle over methodology. Two scientists reportedly resigned over the dispute, in addition to Cullenward and Searchinger.
The protocol's stated intention is to issue further guidance through a consultation or request for information process during 2026. However, no firm timeline has been published. Meanwhile, the unresolved status of forest accounting creates uncertainty for businesses that rely on wood products or manage forest assets as part of their climate strategy.
Accounting method choices carry material consequences for timber and paper sectors
The technical dispute hinges on how carbon storage in managed forests should be credited in corporate emissions reports. One approach, favoured by some industry participants, credits forests broadly for carbon absorbed over time through photosynthesis and growth. This method can make logging and virgin paper production appear climate-positive on paper, even when physical emissions increase.
Critics argue this approach misrepresents the atmospheric impact of forest harvesting. When trees are cut and processed into products, carbon stored in the wood is eventually released. Burning wood for energy releases it immediately. Paper and packaging release carbon as they decompose. Even long-lived timber products eventually reach end-of-life and release stored carbon back into the atmosphere.
A more conservative approach ties removals to additional sequestration that results directly from human intervention. For example, afforestation projects that establish new forests on previously non-forested land, or restoration projects that rebuild degraded ecosystems. This method focuses on net changes in carbon stocks attributable to specific actions, rather than crediting ongoing natural processes in existing forests.
The choice between these methods has direct commercial consequences. Timber companies, paper manufacturers, and packaging businesses could report very different carbon footprints depending on which approach the Protocol adopts. This matters for investor relations, particularly as ESG-focused funds scrutinize climate performance. It also affects procurement decisions, especially in public sector supply chains where carbon reporting requirements are tightening.
For UK businesses that source wood products or operate in construction, furniture, or packaging sectors, the eventual resolution will influence compliance strategies. Many of these companies already face carbon reporting requirements under regulations like the Streamlined Energy and Carbon Reporting framework. Additionally, suppliers to central government must demonstrate net-zero plans to meet Procurement Policy Note 06/21 criteria. Forest accounting rules will determine what claims they can make about wood-based materials.
Industry participation raises questions about standards governance
The Greenhouse Gas Protocol operates through a partnership between the World Resources Institute and the World Business Council for Sustainable Development. Its governance model includes industry participation in technical working groups. This structure is intended to ensure standards are practical and implementable. However, the current controversy suggests the balance between industry input and scientific independence has become strained.
Cullenward's resignation statement accused the Protocol of openly violating its own rules. He specifically criticized the delegation of forest carbon accounting standards to what he characterized as a secret, industry-led working group. His assertion was that the process lacked transparency and gave disproportionate weight to commercial interests over scientific evidence.
Searchinger's departure reinforced these concerns. As technical director for land issues at WRI, he was deeply involved in the Protocol's land-sector work. His decision to leave suggested fundamental disagreements about how the process was being conducted, not simply technical disputes over methodology.
These resignations matter because they affect the credibility of the standards themselves. The Greenhouse Gas Protocol is widely used precisely because it is seen as authoritative and scientifically grounded. If scientists who participate in the process publicly dispute its governance, that undermines confidence in the outputs. For businesses, this creates uncertainty about whether the standards they follow will be accepted by investors, regulators, and customers as legitimate.
The dispute also highlights a broader tension in voluntary standards-setting. Industry participation brings practical knowledge and ensures standards are workable. However, it also creates opportunities for influence that may prioritize commercial convenience over scientific accuracy. Balancing these pressures is essential for maintaining trust, particularly in areas like carbon accounting where financial and reputational stakes are high.
What UK businesses need to understand about forest carbon claims
- The Greenhouse Gas Protocol released its Land Sector and Removals Standard on 30 January 2026, but explicitly excluded forest carbon accounting pending further work.
- Tim Searchinger resigned from the World Resources Institute in August 2026 over concerns about the Protocol's forest accounting process.
- Danny Cullenward left the Protocol's Independent Standards Board in June 2026, citing governance failures and excessive industry influence.
- The Land Sector and Removals Standard takes effect on 1 January 2027, but forest accounting methodology remains undefined.
- Companies disclosing forest carbon impacts before settled guidance is published must explain their chosen methodology transparently.
- The dispute centres on whether to credit managed forests broadly for carbon storage or tie removals strictly to additional human-driven sequestration.
- Timber, paper, packaging, and construction sectors face particular uncertainty about how forest-linked products will be treated in carbon footprints.
Interim guidance creates disclosure burdens and scrutiny risks
Until the Protocol publishes a settled forest carbon methodology, businesses face increased discretion and increased risk. Companies that include forest-related carbon claims in their reporting must choose an approach without clear official guidance. This requires transparent disclosure of methodology, assumptions, and data sources. Without standardization, comparisons between companies become difficult, and scrutiny from investors, auditors, and campaign groups intensifies.
Businesses should expect questions about the scientific basis for any forest carbon claims they make. Specifically, stakeholders will want to understand whether claimed removals reflect real additional sequestration or simply credit natural processes in existing forests. They will also scrutinize whether accounting methods align with physical atmospheric outcomes or rely on favourable but questionable assumptions.
For companies required to report under UK regulations, the uncertainty complicates compliance planning. Streamlined Energy and Carbon Reporting obligations require many businesses to disclose emissions annually. Suppliers to central government must demonstrate carbon reduction plans to meet PPN 06/21 requirements. If these companies use wood products or manage forest assets, they need clarity on how to account for associated carbon impacts.
The lack of settled guidance also affects strategic decisions. Businesses considering investments in forest-related carbon projects, such as afforestation or sustainable forestry initiatives, face uncertainty about how these will be recognized in their carbon accounts. Similarly, procurement teams evaluating wood-based materials against alternatives need to understand how carbon accounting rules will treat different options.
Our work with companies navigating carbon reduction programs and PPN 06/21 compliance shows that methodology transparency becomes critical when official standards are unclear. Businesses that document their accounting choices thoroughly and justify them with reference to scientific evidence are better positioned to defend their reporting when challenged.
Scientific credibility versus commercial feasibility in standard-setting
The fundamental tension in this dispute is between scientific accuracy and commercial practicality. Scientists like Searchinger and Cullenward argue that forest carbon accounting must reflect real atmospheric impacts. Therefore, harvesting trees should be recognized as releasing stored carbon, not removing it from the atmosphere. This view prioritizes physical accuracy over accounting convenience.
Industry participants argue that managed forests provide genuine climate benefits through ongoing carbon sequestration. They contend that sustainable forestry practices can maintain or increase forest carbon stocks over time, even while harvesting wood for use. From this perspective, crediting forests for carbon storage recognizes the role of working forests in climate solutions and encourages sustainable management.
Both positions have merit, but they lead to very different accounting outcomes. The challenge for the Greenhouse Gas Protocol is to develop a methodology that is scientifically defensible while remaining practical for businesses to implement. This requires balancing precision against data availability, theoretical accuracy against measurement feasibility, and scientific rigour against commercial needs.
The current impasse suggests this balance has not yet been found. The decision to exclude forest accounting from the January 2026 standard indicates the Protocol recognized it could not resolve the dispute in time. However, postponement creates its own problems. Businesses need clear guidance to plan investments, report consistently, and make credible climate claims. Prolonged uncertainty undermines these objectives.
For UK businesses, the lesson is that carbon accounting remains a developing field with significant unresolved questions. Standards that appear settled can be reopened when new evidence emerges or stakeholder disputes intensify. Companies should therefore build flexibility into their carbon strategies and avoid over-reliance on specific accounting treatments that may change.
Where to find authoritative guidance on carbon reporting
The Greenhouse Gas Protocol website provides the current Land Sector and Removals Standard, along with updates on the forestry consultation process. The UK government's Streamlined Energy and Carbon Reporting guidance sets out mandatory disclosure requirements for many businesses. The Procurement Policy Note 06/21 explains carbon reduction plan requirements for government suppliers.
The Department for Energy Security and Net Zero publishes annual conversion factors for company reporting, which many businesses use to calculate emissions. For broader context on UK climate policy and net-zero commitments, the Climate Change Committee provides independent analysis and progress reports.
Businesses seeking support with carbon reporting compliance can access resources through structured training on emissions measurement and verification. Given the evolving state of forest carbon accounting, professional advice may be necessary to navigate methodology choices and disclosure requirements appropriately.