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This chapter begins with an overview of methane as a greenhouse gas (GHG). It then examines the principal agricultural methane sources, beginning with enteric fermentation in ruminants. The chapter reviews mitigation strategies for enteric emissions, followed by assessment of methane from manure management. It moves on to discuss methane from flooded rice paddies, before expanding the view to wetlands, grazing lands and other land-use related systems. Finally, the chapter explores the implications of different metrics for measuring the climate impact of methane and wider policy issues in mitigation. The goal is to provide a comprehensive, critical, and policy-relevant overview — one that acknowledges scientific uncertainties and highlights pathways toward meaningful methane reductions while preserving food security.
- 1 Introduction
- 2 Methane as a greenhouse gas: an overview
- 3 Methane from enteric fermentation in livestock
- 4 Establishing a context for enteric methane as a mitigation target
- 5 Mitigation of enteric methane
- 6 Methane emissions from manure
- 7 Methane emissions from flooded rice paddies
- 8 Methane emissions from wetlands and other landuse systems
- 9 The role of grasslands and trade-off issues
- 10 Metrics and policy implications
- 11 Conclusion
- 12 Where to look for further information
- 13 References