On 25 June 2013, President Obama announced a national "Climate Action Plan" (CAP) to reduce emissions of carbon dioxide and other greenhouse gases, as well as to encourage adaptation to expected climate change. One of the more significant initiatives within the CAP focused on the control of methane emissions, a potent short-lived climate pollutant. It called for the U.S. Environmental Protection Agency (EPA) and the Departments of Agriculture, Energy, Interior, Labor, and Transportation to develop a comprehensive interagency "Strategy to Reduce Methane Emissions" (Strategy). The Strategy commits to new steps to cut emissions through both voluntary actions and proposed rulemaking, and outlines the Administration's efforts to improve the measurement and assessment of these emissions. This book's objective is to discuss emission sources of methane, and to examine strategies of reducing greenhouse gases.