With this Article, ELR News & Analysis concludes our year-long series of excerpts from Legal Pathways to Deep Decarbonization in the United States, forthcoming from ELI Press. We believe the urgency and importance of this topic, coupled with the book’s original, policy-oriented treatment of it, warranted extensive advance coverage. Previous installments examined an array of specific sectors across the entire U.S. economy, with many more included in the published volume. In this final excerpt, one of the book’s co-editors reflects on the deep decarbonization project, its extension and application through the “legal pathways” described by the contributing authors, and its significance for the future.