Methane Emissions from Livestock Operations: Sources, Sinks, and Mitigation Strategies

Livestock operations significantly contribute to global methane (CH4) emissions, a potent greenhouse gas. This occurs primarily through enteric fermentation (a digestive process in ruminant animals that produce methane) and manure management. This review synthesizes the current understanding of the sources of methane within livestock farming systems. It focuses on the primary drivers of these emissions, namely methane production during ruminant digestion and emissions from manure handling. The review also explores the concept of methane sinks, highlighting the processes that remove methane from the atmosphere and their role in the global methane cycle. While natural methane sinks exist, their capacity to offset methane emissions from livestock operations is limited. This review therefore discusses a range of mitigation approaches, categorized into animal and feed management, diet manipulation, rumen manipulation, and advanced technologies. Synthesizing these elements provides a clear understanding of the challenges and opportunities in addressing livestock-related methane emissions. Effective strategies should aim to reduce methane production without negatively impacting animal productivity and health. This emphasizes that addressing sustainable livestock production requires integrated approaches that simultaneously tackle climate change mitigation.