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A team of journalists analysed three scientific studies that used satellite images to check the results of a number of forest offsetting projects. The saved carbon emissions were converted into credits that companies can buy and use to offset their own carbon emissions.
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Two different groups of scientists looked at 87 Verra-approved active projects. A number were left out by the researchers.
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The two studies found that only eight out of 29 Verra-approved projects showed evidence of meaningful deforestation reductions. The researchers found that 94% of the credits the projects produced should not have been approved.
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The journalists again analysed the results and found that the baseline scenarios of forest loss appeared to be overstated by about 400%.
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Verra strongly disputed the studies' conclusions and said the methods the scientists used cannot capture the true impact on the ground. It said it already uses some of the methods the researchers used, but not for this project type.
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The Guardian reported that 90% of Verra-certified REDD+ credits are worthless. Verra has already addressed the main criticisms of its REDD+ methodologies by implementing a jurisdictional allocation approach and re-assessing project baselines every six years.
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Verra has certified over 1,500 carbon projects that have delivered billions of dollars for rural areas in the global south to fight climate change and biodiversity loss.
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Verra was concerned about the use of synthetic controls, but the authors argue that the comparison areas used in both cases are real areas, with deforestation levels based on rates that are local to the projects.
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The evidence from the analysis suggests we cannot trust the predictions of deforestation made by these projects, said Thales West, a lead author on the studies.
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Erin Sills, a professor at North Carolina State University, said the findings were "disappointing and scary", and that urgent changes were needed to finance rainforest conservation.
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David Coomes, a professor of forest ecology at the University of Cambridge, said there were strong discrepancies between the amount of deforestation his team estimated the projects were avoiding and what the carbon standard was approving.
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Julia Jones said the world was at a crossroads when it came to protecting tropical forests and that the carbon markets must be made to work if they are to be scaled up.
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The main challenge with realising climate change mitigation benefits from Redd+ is reliably forecasting the future. This report shows that future forecasts have been overly pessimistic, and hence have vastly overstated their Redd+ climate benefits.
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Shell, Gucci, Pearl Jam, BHP and Salesforce said they bought credits that were certified by Verra, while Lavazza said it plans to look more closely into the project.
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The fast food chain Leon and EasyJet have stopped buying carbon offsets, and instead focus on developing new zero-carbon emission aircraft technology.
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Barbara Haya, director of the Berkeley Carbon Trading Project, has been researching carbon credits for 20 years and has found that most credits do not represent emissions reductions at all. She is starting to give up on the offset market.