Innovation in maintaining the quality of learning needs to be done because students are still carried away with the online learning atmosphere. This study aims to validate the feasibility and analyze the effectiveness of the product development of team-based project learning tools with a natural exploration approach to the formation of environmentally friendly characters in students of the Geography Education study program in the resource geography course. This research is research and development using the ADDIE development model. The trial subjects were students of the geography education study program for resource geography courses, designed with quasi experimental nonequivalent control group design. The research instruments are observation sheets, interviews, questionnaires, documentation, tests, and non-tests. Qualitative descriptive data analysis techniques to measure feasibility and N-gain to see the effectiveness of product development. Based on the results of expert validation, product development is very feasible to use with a percentage of 90%. Product development is effective for use with an average N-gain value of 0.4 in the medium category in the experimental class and a value of 0.2 in the low category in the control class.

Keywords: Team based Project Learning, explore approach, Environmentally Insight Character