This Study was prepared by ICF for Natural Allies for a Clean Energy Future (NACEF) and the Partnership to Address Global Emissions (PAGE). The purpose of the Study is to provide a detailed explanation of how lifecycle analyses (LCAs) of greenhouse gas (GHG) emissions for US exports of liquefied natural gas (LNG) are estimated and how those estimated emissions compare with the LCA GHG emissions of alternative fuels such as coal and petroleum products. The Study presents a Base Case analysis using transparent, well-documented and consistent data and methods and, where uncertainties exist for important parameters used to make these estimates, the Study also provides sensitivity analyses.