"'Do You Want Paper or Plastic?' An Inquiry into Single-Use Grocery Bags" is an inquiry-based, solutions-focused environmental education unit developed for the U.S. Fund for UNICEF. Field-tested in two U.S. southeastern regions, the unit engages students as informed change makers who investigate the production, consumption, and disposal of single-use, disposable grocery bags. Based upon their inquiries, students become empowered as "solutionaries", or individuals who plan and implement action steps that lead to a sustainable future. Results from the curriculum pilot offer support for the importance of interdisciplinary environmental education in the elementary setting.