Unit 4 · Biodiversity and Environment

Managing Solid Waste: The Three Rs Presentation

ScienceSubject
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Unit 4 · Biodiversity and Environment

Managing Solid Waste: The Three Rs

Science & Technology · Grade 7

Learning Objectives

🗑️

Say what solid waste is and how it harms health and the environment

🍌

Tell biodegradable from non-biodegradable, and explain why mixing ruins both

🔢

Explain why the three Rs are in that order, and which one is best

🪴

Give real examples of each R from your own home and school

Why Is It Lying in the Street?

  • What could this do to the health of the people walking past?
  • What happens to the cow standing in it, eating plastic it cannot digest?
  • It is not there because the people living here are dirty
  • It is there because nothing in it was ever separated
A large pile of mixed household waste across a street with a cow standing in it

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Presenter notes: Open by asking the class to name the three Rs, because nearly all of them can. Take it, write the three words on the board in the right order, and then ask the question that opens the lesson: which one of these three is the best? Almost every hand will point at recycling, because that is the word everybody has heard. Do not correct anybody. Just say that by the end of the period they will know that recycling is the worst of the three, and let that sit. Nothing holds a class like being told that the thing they were sure about is upside down.