Recycling and Waste: Measuring What a School Throws Away
Suggested grades: 3–6, adaptable Time: 3–5 sessions Subjects: Science, Mathematics, Writing, Civics
Learning Objectives
- Distinguish among reducing waste, reusing materials, recycling, and disposal.
- Collect and represent classroom or school waste data safely.
- Calculate percentages or compare quantities when the data support those calculations.
- Write clear instructions for a recycling procedure.
- Use evidence to propose a practical improvement to the school's waste practices.
Procedure
- Introduce: Discuss the difference between recyclable, reusable, compostable, and trash materials. Emphasize that accepted materials vary by local program.
- Audit safely: Instead of having students handle mixed cafeteria garbage, have adults pre-sort a clean sample or provide clean classroom materials. Students classify items using the school's local recycling rules.
- Collect data: Record counts or masses by category. Create a table and graph. Calculate a percentage only when the denominator and categories are clearly defined.
- Research local rules: Compare the school's procedure with the current guidance from the local waste authority. Do not assume a material is recyclable simply because it has a recycling symbol.
- Writing: Teams write step-by-step instructions for another classroom. Include what belongs in each bin, what does not, and what to do when an item is uncertain.
- Communication: Create an informational poster, short announcement, article, or optional original song/poem. The message should communicate verified information rather than guilt or fear.
- Evaluate: Students identify one realistic improvement and explain how the class could measure whether the change worked.
Assessment
Assess the data table/graph, classification accuracy, written procedure, and evidence-based recommendation. For older students, require a percentage or comparison supported by their actual class data.
Safety
Students should not handle dirty cafeteria waste, broken glass, sharp objects, medical waste, or unknown materials. Follow school and local sanitation procedures.
Teacher Note
Recycling rules differ by community and change over time. Verify the local program before teaching a specific list of accepted materials.