Anaerobic Digesters on Dairy Farms: A Mixed Solution for Methane Emissions
Anaerobic digesters are being promoted as a solution to reduce methane emissions from dairy farms by converting manure into biogas. This technology, which captures methane and carbon dioxide from manure, is being implemented on a large scale, with over 17,000 digesters in the EU and about 400 in the US. However, the effectiveness of these digesters is under scrutiny. While they can reduce methane emissions by 91% during storage, issues such as leaks and increased ammonia production raise concerns. A study in California, where significant investments have been made in digesters, found that while emissions were reduced at many dairies, some experienced increased emissions due to leaks. Additionally, the financial incentives for biogas production may encourage the expansion of factory farms, potentially leading to more environmental harm. 
