Аннотация:This study aims to find out (1) the effect of problem-based learning model on critical thinking skill, and (2) the effect of problem-based learning model on environmental attitude. This study employs a quasi experiment model using pretest-postest for control group design. The subject of the study is Social Science Education Department students of Maulana Malik Ibrahim State Islamic University of Malang, Indoensia who were studying in the odd semester of Academic Year of 2018/2019. The numbers of students in experimental and control class are 25 people. The assessment instrument used for environmental attitude is Likert scale, and essay test is used for assessing the critical thinking skill. The data analysis in this study used normality test, homogeneity test, and independent sample t-test. The results of the study indicate that (1) learning activity using PBL model affects the students’ critical thinking, because through PBL learning, students are trained to think critically to solve real problems in groups. 2) The learning activity using PBL model affects the students’ environmental attitude, because the problem solving process in PBL learning encourages students to care about their environment.
