A dairy digester is a device that captures methane resulting from the decomposition of manure.
Why do we care about decomposing manure?
According to the California Department of Food and Agriculture (CDFA), methane emissions from manure account for about 2.7% of total statewide greenhouse gas emissions (GHGs). Since methane is a short-lived GHG, reducing these emissions is an important way to slow climate warming in the short term.
CDFA estimates that by installing dairy digesters, California dairy farms will reduce greenhouse gases by more than 21 million metric tons over 10 years. The use of dairy digesters in California has already helped reduce 25% of total dairy and livestock manure methane emissions, as part of the state’s efforts to further reduce dairy methane emissions by 40% by 2040.