This Review focuses on the recent progress in the area of CO2-responsive polymers and provides detailed descriptions of these existing examples. CO2-responsive polymers can be categorized into three types based on their CO2 responsive groups: amidine, amine, and carboxyl groups. Compared with traditional temperature, pH, or light stimuli-responsive polymers, CO2 responsive polymers provide the advantage to use CO2 as a ``green{''} trigger as well as to capture CO2 directly from air. In addition, the current challenges of CO2-responsive polymers are discussed and the different solution methods are compared. Noteworthy, CO2-responsive polymers are considered to have a prosperous future in various scientific areas.