New tech cuts barn methane emissions by up to 90% Field trial in Denmark validates MEPS for dairy operations21 August 2025 21 August 2025 2 minute read 2 minute read By: By: Global Ag Media EuropeA field trial in Denmark found that Ambient Carbon's Methane Eradication Photochemical System (MEPS) eliminated up to 90 per cent of dilute methane emissions from dairy barn air. MEPS uses a patented gas-phase photochemical process to break down methane, according to a company-issued press release. It is the first real-world validation of a scalable technology for reducing methane emissions from livestock barns and suggests such emissions can be remediated at commercial scale. The trial, conducted in a 250-cow, open-sided dairy barn at the Hofmansgave Foundation in Denmark, tested a MEPS unit housed in a 40-foot shipping container. In addition to removing methane, the system also captures ammonia and other odours while generating sterile water vapour and fertilizer.