Published by Todd Bush on January 20, 2023
Verra is disappointed to see the publication of an article in the Guardian, developed with Die Zeit and SourceMaterial, incorrectly claiming that REDD+ projects are consistently and substantively over-issuing carbon credits. Verra worked closely with both publications in the run-up to the publication to explain why this claim is untrue, as it is based on studies that use a “synthetic control” approach or similar methods. We want to share this information with our stakeholders and the wider climate community.
Verra has issued over one billion carbon credits since 2009, which have enabled billions of dollars to be channelled to urgent climate action, sustainable development, and the protection and restoration of ecosystems. First and foremost, enabling finance to reach high-quality activities on the ground is the purpose of Verra’s work – more finance enables more climate action, which is vital to keeping us on track for the Paris Agreement goal.
Verra is able to mobilize finance at this scale because we certify projects that avoid, reduce, or remove emissions. These impacts are measured in tonnes of carbon dioxide or its equivalent in other greenhouse gasses (CO2e). To ensure that this work is credible and reflects scientific consensus, Verra works with academics and experts globally to create and refine methodologies.
Verra welcomes scrutiny of methodologies and contributions from other experts. This is actively encouraged through Verra’s standard, methodology, and project development processes, all of which include expert review and public consultations.
We are aware of the West et al. 2020 and 2023 and Guizar-Coutiño et al. 2022 studies, which compare regional deforestation to project deforestation rates and on which the Guardian and Die Zeit base their claims. Although these studies provide data that is a useful contribution to the wider work on optimizing methodologies for forest carbon projects, they have limited utility for assessing the impact of REDD+ projects because they do not consider site-specific drivers of deforestation. Specifically, they reach incorrect conclusions because they rely on synthetic controls that do not accurately represent the pre-project conditions in the project area, as the studies’ authors themselves acknowledge.
Synthetic controls compare a project to a control scenario based on a set of variables that impact deforestation, known as covariates, whereas Verra’s approach for REDD+ projects compares them to real areas. Synthetic controls are used effectively by Verra for certain types of projects, such as Improved Forest Management in North America. However, this approach is not suitable for REDD+ projects because of the difficulty in finding points that match inside and outside the project area at the start of the project.
REDD+ projects are not randomly located; local factors that mean a particular area is at acute risk of deforestation are a major determinant for selecting project areas. Verra REDD+ methodologies are designed to address the variability between the project area and surrounding areas, whereas the synthetic controls used in these studies do not effectively do this. This is why the studies calculated emission reductions different from the number of credits that Verra issued to the projects.
An important part of methodologies is determining the baseline against which climate action should be measured – i.e., predicting what would have happened if a project was not implemented. Baselines are used to determine how many carbon credits a project can issue by comparing the rates of deforestation in a project area against the baseline. To ensure conservativeness of credit issuance, Verra methodologies include procedures for calculation and application of a conservativeness deduction to total estimated emission reductions.
Recently, Verra has made baselines more responsive to unpredictable local changes that impact deforestation rates. For example, under Bolsonaro, Brazil’s deforestation rate went up – this scenario could not have been predicted when the baseline was set. Accordingly, Verra-certified REDD+ project baselines are now reassessed every 6 years, instead of every 10 years (except in Peru due to government policies).
To further strengthen the accuracy of REDD+ baselines, Verra is currently working to transition all REDD+ projects to one methodology. This methodology, which is under development, uses jurisdictionally-allocated baseline data to ensure consistency in emission reductions within a set region.
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