Americans throw away 254 million tons of trash every year, and students are naturally curious about where it all goes. , a 30-lesson interdisciplinary science unit: In this unit, students study the concept of innovation and learn to manage and dispose of waste in creative and environmentally friendly ways, all while building an understanding of sustainability, recycling, environmental science, and the green economy. Suggestions and guidance are included on how teachers can adjust the rigor of learning tasks based on students' interests and needs. Grades 3-4