A Wisconsin project dubbed the “world’s largest manure biogas project” emits nearly 5,000 metric tons of climate-warming methane annually, roughly equivalent to emissions from 30,000 gasoline-powered vehicles, according to state data that adds to concerns about the impacts of large-scale manure digesters.
The biogas project in question, owned by BC Organics, LLC, emitted 4,921 metric tons of methane in 2024, at least in part due to a leak at the facility, according to its 2025 filing with the Wisconsin Air Management program.
