On her first day as the new CEO of Citigroup Inc. (Citi), Jane Fraser announced Citi’s commitment to net-zero greenhouse gas emissions (GHG) by 2050. The case examines the implications of such a decision, including the need to work both on Citi’s own operations as well as help transition those of its clients. The case allows for an examination of the green bond market, and separately, the market of social bonds and sustainability-linked bonds. The case discusses the various principles and frameworks for green and social bonds and their potential benefits and risks.