This study examines the increasingly widespread impacts of the climate change crisis on the ecological, social, and economic environment, both globally and in Türkiye, and the actions taken. Ecologically, the climate change crisis causes various ecological damages such as air pollution, water pollution, and drought; sociologically, it leads to employment problems and social inequality; and economically, it brings financial instability, default, and investment risks. Within the framework of sustainability, green finance and banking approaches are taking various actions to curb these negative impacts. The negotiations and decisions made under the Kyoto Protocol and Paris Agreement have been pioneering among these actions. The most fundamental of these have been to limit global surface temperature rise to 1.50 °C and prevent greenhouse gas emissions. The IMF, another influential international institution, supports its objectives through stress testing, in addition to ensuring financial stability and risk management. When the actions taken by global and Turkish banks are examined in the study, the projects carried out by İş Bankası in Türkiye with TÜDAV (Türk Deniz Araştırmaları Vakfı) and the funded actions they developed to support women’s employment provide concrete examples. Furthermore, BBVA’s planned establishment of a new global finance unit for clean technologies aimed at sustainable business activities is also evaluated within this framework. The study suggests that green finance and banking products and services in Türkiye should be reviewed and expanded. In this context, it underscores the need to monitor global innovations, raise awareness of sustainability approaches, and support investments in green spaces. Consequently, within the framework of sustainability, green finance and banking, influenced by measures taken globally and in Türkiye, play a crucial mission in combating the climate change crisis.