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Life · Guided lesson

Prevent waste before choosing a bin

About 8 minutes · 3 reading + 5 practice and checks
Time includes reading, practice, and questions. Extra videos or further study are optional.
See this course’s project requirements

A fictional household waste audit separating prevention, reuse, local recycling acceptance and special-disposal questions with checked quantities.

Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.

What to include

  • Record a seven-category stream with unit and period.
  • Calculate prevention and remaining material without duplicate counts.
  • Split suitable cardboard reuse from remaining cardboard.
  • Apply the supplied local guide and balance every route.
  • Write special-provider questions without handling items.
  • Compare and revise the complete plan with honest status labels.

Review and revise

Use these criteria to check your work and choose what to improve.

  • Method: applies the course-specific rules to the supplied cases with visible intermediate work.
  • Accuracy: results agree with the stated facts, units, boundaries and independent checks.
  • Reasoning: explains why the result follows and identifies a limitation or unresolved question.
  • Transfer: completes changed cases and revises the final project when a relevant assumption changes.
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Before you begin

The idea in everyday life

Use the 10 kg stream from lesson 1. Supplied proposed changes: avoid 1 kg of unnecessary printed paper and 0.5 kg of food leftovers through a fictional preparation adjustment. Other rows remain unchanged. No real meal, food-safety or purchasing action is required.

The idea

Prevention avoids a material entering the waste stream; reuse keeps an existing usable item serving a purpose; recycling processes accepted materials. These are different actions and quantities. A prevention estimate must identify the original row it reduces and cannot subtract the same mass again as recycling.

Follow along

Prevent waste before choosing a bin — worked practice

Prevention avoids a material entering the waste stream; reuse keeps an existing usable item serving a purpose; recycling processes accepted materials. These are different actions and quantities. A prevention estimate must identify the original row it reduces and cannot subtract the same mass again as recycling.

Use the 10 kg stream from lesson 1. Supplied proposed changes: avoid 1 kg of unnecessary printed paper and 0.5 kg of food leftovers through a fictional preparation adjustment. Other rows remain unchanged. No real meal, food-safety or purchasing action is required.

  1. 1. 1. Locate

    Identify the two affected original rows.

    You should see: Paper 3 kg; food scraps 2 kg.

  2. 2. 2. Reduce

    Calculate remaining masses.

    You should see: Paper 2 kg; food scraps 1.5 kg.

  3. 3. 3. Total

    Calculate prevention and the remaining stream.

    You should see: 1.5 kg prevented; 8.5 kg remains.

  4. 4. 4. Distinguish

    Explain why 1 kg paper cannot also be counted as collected recycling.

    You should see: It never enters the revised waste stream under this proposal.

Now change one thing

The proposed paper prevention is 0.5 kg instead of 1 kg, with food prevention still 0.5 kg. Enter the remaining stream mass.

Your work

What to finish

A before/after paper and food table with prevention and remainder totals.

Common mistake

Watch for this

Prevented material is removed from the future stream. Counting it again as collected recycling would overstate the plan’s measured routes.

How can I tell I understand it?

Revise a prevention amount and recompute the remaining bounded stream.

Try 3 questions

Quick knowledge check

Answer all 3 questions. Get at least 2 right and the lesson completes automatically.

Not yet passed

You’ll get an explanation for each answer. Signed in? Your results save to your account.

1What is the proposed remaining paper mass?
2Which action is prevention in this case?
3Why separate prevention from recycling totals?
0 of 3 answeredApply the lesson to a short question, then review the explanation.
2
Finish this lesson

Pass the check. We’ll save the progress.

Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.

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Sources and further reading

Explore the references behind this lesson.

EPA: reduction and reuse actions
Source & access notes · checked 2026-10-01

Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.

Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.

Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.

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