Plastic-Free Ocean | Ocean Pollution STEM & Environmental Inquiry Investigation

How could we stop plastic pollution before it reaches the ocean?

Challenge students to investigate one of the world's most pressing environmental problems in this engaging, open-ended Plastic-Free Ocean STEM and inquiry investigation.

Students become part of an international Ocean Innovation Team and investigate where ocean plastic comes from, how it affects wildlife and ecosystems, how communities are responding, and how scientists and engineers are developing new solutions. They then use their discoveries to design their own Plastic-Free Ocean System.

This is more than a research activity. Students must investigate, analyse, design, prototype, explain and reflect as they work towards a solution to an authentic environmental problem.

What will students investigate?

Students explore:

• Where ocean plastic comes from
• How plastic pollution affects wildlife and ecosystems
• How communities can reduce plastic waste
• Technologies designed to collect or prevent plastic pollution
• How product design can reduce waste
• How education can influence people's behaviour
• Which solutions are most effective, practical and sustainable

The Design Challenge

Students use their research to design an Ocean Protection System that:

• Stops plastic before it reaches the ocean
• Protects marine wildlife
• Encourages people to reduce plastic waste
• Is affordable and practical
• Can be used by communities
• Creates long-term change

Every major design decision must be supported by evidence from their investigation.

Why students will love it

Plastic-Free Ocean gives students the opportunity to:

• Think critically about a real-world environmental problem
• Research and evaluate evidence
• Compare different solutions
• Make decisions when there is no single correct answer
• Develop creative and innovative ideas
• Design and communicate a solution
• Consider environmental, social and practical trade-offs
• Explain and defend their decisions
• Reflect on how their thinking changed

Students are encouraged to balance environmental impact, cost, community participation, long-term sustainability, maintenance, education and innovation when developing their solution.

Flexible for different classrooms

Use this investigation for:

• STEM and STEAM
• Environmental science
• Sustainability units
• Ocean and marine studies
• Inquiry-based learning
• Project-Based Learning (PBL)
• Design & Technologies
• Enrichment and extension
• Gifted and high-potential learners
• Early finisher challenges
• Individual, pair or small-group work

The investigation can be completed across several lessons, with an optional prototype/build stage for students who want to take their designs further.

Extend the Challenge

Ready to push the thinking further?

Students can respond to changing conditions such as a tourism boom, increased fishing-net pollution or the introduction of a new biodegradable plastic. They can also present their system to a local council or environmental organisation and defend why their solution deserves support.

A complete investigation experience

The resource provides a clear pathway from investigation → analysis → design → prototype → explanation → reflection, while leaving room for students to approach the problem in their own way.

There is no single correct answer. Students are challenged to use evidence, creativity and reasoning to develop a solution that could make a genuine difference.

Perfect for

Grades 3–8 | Years 3–8

STEM • Environmental Science • Sustainability • Ocean Pollution • Inquiry • PBL • Design Thinking • Critical Thinking • Creative Thinking • Enrichment • Extension

Want to Take the Thinking Further?

Explore the MindStretch Investigation Files for more immersive, real-world investigations where students research, analyse, design, solve problems and justify their decisions. Each investigation challenges students to think beyond the obvious and develop their own evidence-based solutions.

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The MindStretch Investigation Files place students in the role of real investigators tackling authentic problems from today's world.

Students learn to think like engineers, scientists and designers by researching real evidence, making informed decisions and creating innovative solutions—because there is no single correct solution.