C2ES’s 2019 report is the culmination of a collaborative exercise including a group of companies examining potential scenarios for achieving mid-century decarbonization goals. This scenario exercise aimed to build a common understanding—benefitting both these firms and broader societal efforts—of the potential for alternative pathways to deep decarbonization in the United States and to highlight important commonalities and differences among such paths. The resulting report presents the scenarios and the insights, and particularly emphasizes social and policy dimensions as key drivers of change, in addition to the technical dimensions more commonly studied.