Objectives The purpose of this study is to investigate the effectiveness of the major-integrated extracurricular program of ‘Climate Ecosystem Challenge’ on pre-service early childhood teachers, focusing on environmental concern, climate environmental risk perception, sense of community, and collaborative self-efficacy. Methods The research subjects consist of 9 students attending Nano-LAB Meta at A University in the Chungcheong region. The trends(mean, standard deviation) and normality(Kolmogorov-Smirnov test, Shapiro-Wilk test) of the study variables, along with the reliability assessment using Cronbach's α, were examined in SPSS 23.0. The effectiveness of major-integrated extracurricular program was tested using the non-parametric statistic of the Wilcoxon test, which is suitable for testing differences in paired samples. Results The main results are as follows: First, the difference (b-a) between the pre- and post-mean scores (a) and the post-mean score (b) indicated a minimum increaseof 0.55 points and a maximum improvement of 1.04 points in the post-mean score compared to the pre-mean score across all study variables. Second, despite the normality test not demonstrating statistical significance for some study variables, there is an intention to conduct nonparametric statistical analysis, which is justified by the central limit theorem. Third, the post test scores were higher than the pretest scores of the study variables, and the difference was statistically significant. Conclusions The research findings reaffirm the significance of extracurricular education integrated with the major. In this regard, we aim to promote mutual development between the university and the local community by proposing measures for major-integrated extracurricular education with consideration for community service contributions.