The study was conducted for the purpose of determining the effect of concept cartoon applications with the theme of environment problems on the attitudes of candidate teachers and receiving the candidate teachers' ideas on the process in the fall semester of 2019-2020 academic year. The participants were composed of 105 students in the department of primary school teaching at a university located in Central Black Sea Region of Turkey. In the study, mixed method research design was adopted based on both quantitative and qualitative data. In the quantitative part of the study, an experimental design with pretest-posttest control groups was used. The qualitative part of the research was designed according to the case study pattern. The candidate teachers in the experimental and control groups were applied "Environmental Attitude Scale" for the purpose of detecting their attitudes with respect to environment problems at the beginning of the process. Later student-centered courses were held with the experimental group using the concept cartoon technique were carried on in line with the curriculum with the control group. The findings revealed that the concept cartoon applications developed positively the candidate teachers' attitudes toward environment problems. Additionally, it was expressed by the candidate teachers that the concept cartoon applications developed many significant skills including problem solving, critical thinking, questioning, discussing, creativity and detecting and remedying concept mistakes.