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The report 'Methane Unmasked' by Changing Markets Foundation examines methane leakages at biogas plants in Denmark, focusing on the Nature Energy (Shell) plant in Videbæk and the Tønder plant. Using optical gas imaging and trace gas analysers, the investigation found significant methane releases at the Videbæk plant, including suspected intentional venting from a compressor unit stack. It also identified high methane concentrations near the Tønder plant, though the exact source could not be pinpointed. The report argues that methane leakage is a systemic problem in the biogas industry that can negate climate benefits, and it calls for stronger EU-wide regulations as current Danish third-party audits are deemed inadequate.