<![CDATA[One of the 21st century skills that is important to develop in learning is critical thinking. Critical thinking is essential in life in order to find solutions such as issues with global warming nowadays. To increase the critical thinking ability of students is implementing Problem-Based Learning (PBL) model. This study aims to determine the effect of PBL model implementation on students' critical thinking skills on global warming topics and the improvement of students' critical thinking skills. This research uses a quantitative approach with a pre-experimental design method of one-group pretest-posttest. The population in this study were students of class X SMA Negeri 3 Samarinda, totaling 10 classes with a sample of 36 students from class X-J. Data collection used a test technique of 14 multiple choice questions given before and after treatment. The results showed that the PBL model had an effect on critical thinking skills with an Asymp. Sig. (2-tailed) of 0.000 and there was an increase in critical thinking skills with an N-Gain value of 0.58 which is included in the medium criteria. Each indicator of critical thinking skills increased after the implementation of PBL and the highest increase was in the likelihood and uncertainty analysis indicator. These results can contribute to improving the quality of education, especially in terms of developing students' critical thinking skills through the implementation of innovative and contextual learning models such as PBL. In addition, more effective learning models are needed to improve all of the critical thinking indicators.]]>
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