After the Department of Energy published a supplemental environmental impact statement claiming that exporting liquefied natural gas from a proposed Alaska terminal would decrease greenhouse gas emissions, we submitted comments challenging the Department’s methodology and assumptions. In particular, our comment letter explains that the Department’s analysis unreasonably assumes that the Project would merely displace existing exports from Gulf Coast facilities, and thus overlooks the inevitable economic reality that the Project will increase total natural gas supply and consumption. As our comment letter explains, courts have rejected this “perfect substitution” assumption in related contexts. Moreover, our letter explains that the Department’s lifecycle analysis insufficiently considers the choice of destination countries and is inconsistent with the agency’s analysis of economic impacts.