The UNECE Group of Experts on Coal Mine Methane (CMM) has released the second edition of the Best Practice Guidance for Effective Methane Drainage and Use in Coal Mines. Since the first edition was published in 2010, the industry practice and regulations have evolved, and this second edition captures the most critical developments. The second edition also includes additional case studies that illustrate the application of the best practices in coal mines worldwide. The principles-based second edition of Best Practice Guidance does not replace national or international laws and regulations. Rather, it complements them through a holistic approach to safer and more effective methane management practices.