<![CDATA[The Project-Based Learning (PjBL) model places students at the center of learning to gain real experience related to environmental sustainability. This study describes the effectiveness of the PjBL model in producing bioplastics from banana peels within green chemistry material to enhance high school students' environmental concern attitudes and pro-environmental behavior. A quasi-experimental method with a non-equivalent control group design was used. The sample consisted of class X.1 as the experimental group and X.2 as the control group, selected through cluster random sampling. Results show the average N-gain of environmental concern attitude in the experimental class was higher than the control class, with an effect size (r) of 0.67 (large category). Pro-environmental behavior also showed a highly significant difference (Mann-Whitney U, Z = -3.932; Asymp. Sig. < 0.05) with an effect size (r) of 0.50 (large category). It is concluded that the PjBL model for producing banana-peel bioplastics is effective in enhancing students' environmental concern attitudes and pro-environmental behaviors]]>
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