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Cutting plastic to zero in the school canteen

A high-school canteen with 1,200 students produces 900 plastic bottles and 400 single-use cups a day. How do you end this without a bigger budget?

Social Responsibility Environment Beginner #Sustainability #Social Impact
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Problem

The canteen meets daily drink demand with single-use plastic. The school wants to announce an environmental policy, but the operator fears losing revenue.

Your task: design a system that removes plastic entirely, protects the canteen’s income and is adopted voluntarily by students.

Background

The school has four water fountains, two of them broken. 60% of students say they bring a bottle from home but buy one when they forget. The canteen sells a bottle for 10 TL and about a third of its daily revenue comes from drinks.

Constraints

  • No extra budget; the investment must pay for itself within six months.
  • The canteen contract cannot be changed mid-year.
  • No mandatory ban can be imposed on students.

Expected solution

A plan of at most two pages: implementation steps, a three-month calendar, a proposal that offsets the canteen’s revenue loss and three metrics you would track.

Case process

  1. 1

    Read the case

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  2. 2

    Form your team

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  3. 3

    Submit your solution

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  4. 4

    Evaluation

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Submitted solutions

2 solutions
Solution

Deposit Ring at the Cafeteria

Kantinde depozito halkası

Ahmet K. · 19 August 2026

2

I propose adding a 5 TL deposit to every plastic bottle sold in the cafeteria. Students who return the bottles get their money back on their cafeteria card. For the first month, the school cooperative will set aside a fund of 2,000 TL; the collected bottles will be given to a recycling company, and the proceeds will go back into the fund. This way, the system will be self-financing starting in the second month. We’ll use the barcode data from the cafeteria cash register for tracking: the ratio of bottles sold to bottles returned will be posted on the weekly bulletin board.

Kantinde satılan her plastik şişeye 5 TL depozito eklenmesini öneriyorum. Şişeyi geri getiren öğrenci parasını kantin kartına geri alıyor. İlk ay için okul kooperatifi 2.000 TL'lik bir fon ayırır; toplanan şişeler geri dönüşüm firmasına verilir ve gelir fona döner. Böylece sistem ikinci aydan itibaren kendi kendini finanse eder. Ölçüm için kantin kasasındaki barkod verisini kullanırız: satılan şişe sayısı ile geri gelen şişe sayısının oranı haftalık panoda yayınlanır.

Solution

Water Bottle Campaign + Water Dispenser Network

Matara kampanyası + sebil ağı

Selin Doğan · 19 August 2026

1

The fastest way to reduce plastic is to eliminate the need for it. I suggest installing filtered water dispensers on all three floors of the school and distributing water bottles with the school logo to 9th graders during registration week. The cost could be covered by a local sponsor; in exchange, the company’s logo would appear on the water fountains. Raising the price of bottled water in the cafeteria, rather than eliminating its sale entirely, encourages behavioral change without forcing it. Our goal is a 40% reduction in the number of bottles sold by the end of the first semester.

Plastiği azaltmanın en hızlı yolu ihtiyacı ortadan kaldırmak. Okulun üç katına da filtreli su sebili koyup 9. sınıflara kayıt haftasında logolu matara dağıtmayı öneriyorum. Maliyeti sponsor bir yerel firmayla karşılanabilir; karşılığında sebillerin üzerinde firma logosu yer alır. Kantinde şişe satışının tamamen kaldırılması yerine fiyatının artırılması, davranış değişimini zorlamadan sağlar. Birinci dönem sonunda satılan şişe sayısındaki düşüş hedefimiz %40.

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Comments

3 comments
Comment

Ahmet K. · 19 August 2026

0

The cafeteria at our school already sells glass bottles, so this situation doesn't really apply to us. Still, I'll bring up the idea of a deposit with our principal.

Bizim okulda kantin zaten cam şişe satıyor, o yüzden bu vaka bize uymuyor gibi. Yine de depozito fikrini müdürümüze anlatacağım.

Comment

Selin Doğan · 19 August 2026

0

There’s a risk with the water bottle campaign: the bottles are going missing. If name tags and a class-based tracking list are added, the loss rate drops significantly.

Matara kampanyasında bir risk var: mataralar kayboluyor. İsim etiketi ve sınıf bazlı takip listesi eklenirse kayıp oranı ciddi düşüyor.

Comment

Burak Ergün · 19 August 2026

0

The deposit system works well in practice; we set up something similar at our university club. My only suggestion: place the return bin at the exit of the cafeteria, not inside it—that way, there won’t be a line.

Depozito fikri sahada işe yarıyor, üniversitedeki kulübümüzde benzerini kurmuştuk. Tek uyarım: geri toplama kutusunu kantinin içine değil çıkışına koyun, kuyruk oluşmuyor.