Dairy Manure Co-composting with Wood Biochar Plays a Critical Role in Meeting Global Methane Goals.

Livestock are the largest source of anthropogenic methane (CH) emissions, and in intensive dairy systems, manure management can contribute half of livestock CH. Recent policies such as California's short-lived climate pollutant reduction law (SB 1383) and the Global Methane Pledge call for cuts to livestock CH by 2030. However, investments in CH reduction strategies are primarily aimed at liquid dairy manure, whereas stockpiled solids remain a large source of CH.