Natural science students are intended to have more sense of nature connectedness than non-natural science students because their understanding and awareness about environment they received from environmental education. Together, sense of nature connectedness, environmental understanding and awareness encourage those students to behave environmentally in the sake of nature protection. This study was undertake to confirm the positive correlation between those previous factors (the predictor) and the practice of pro-environmental behavior among natural science students (the response). Utilizing a semi-quantitative online questionnaire and Gamma correlation analysis, this study identified that the concern of nature condition was positively correlate with PEB practice among natural science students. However, the correlation was strong only when respondents did PEB practice oftenly. The conclusion of this study is the environmental concern has positive contribution to PEB practice, but the occurance of PEB practice is more influenced by how often the PEB is performed by natural science students.