Tech for Good · Term 3

Sustainable Tech

Looking at the environmental footprint of digital devices and how to reduce waste.

About This Topic

Sustainable Tech guides Year 3 students to examine the environmental footprint of digital devices, such as tablets and laptops, across their full lifecycle: raw material extraction, manufacturing, daily use, and end-of-life disposal. Students trace how mining rare metals pollutes waterways, factories consume energy, and discarded devices create electronic waste that harms landfills and oceans. They connect these impacts to everyday choices, like upgrading phones too often.

Aligned with AC9TDE4K02, this topic builds knowledge of sustainable design processes within the Technologies curriculum. Students analyze lifecycles, propose features for devices with longer lifespans, such as modular parts for easy repairs, and critique e-waste practices, including Australia's National Television and Computer Recycling Scheme. These activities develop systems thinking, ethical decision-making, and skills in evaluating human impacts on the environment.

Hands-on approaches make sustainability concrete for young learners. When students map device journeys with everyday objects or audit classroom e-waste, they grasp cause-and-effect relationships firsthand. Collaborative design challenges encourage creative problem-solving, turning awareness into agency and making abstract concepts like resource depletion vivid and relevant.

Learning Objectives

• Identify the stages in the lifecycle of a digital device, from raw material extraction to disposal.
• Explain how the manufacturing and use of digital devices contribute to environmental pollution.
• Propose design features for digital devices that promote longevity and repairability.
• Critique current methods for managing electronic waste in Australia.
• Compare the environmental impact of different disposal methods for electronic devices.

Before You Start

Materials and their Properties

Why: Students need to understand that different materials have different properties and origins to grasp concepts like raw material extraction and the composition of devices.

Needs and Wants

Why: Understanding the difference between needs and wants helps students analyze consumer behaviour related to upgrading technology too frequently.

Key Vocabulary

Lifecycle	The entire journey of a product, including how it is made, used, and thrown away.
Electronic waste	Discarded electrical or electronic devices, often containing valuable or hazardous materials.
Resource extraction	The process of mining or gathering raw materials from the Earth to make products.
Repairability	How easily a product can be fixed or mended when it breaks, often by using standard parts.
Modular design	A design where a product is made up of separate, interchangeable components or modules.

Active Learning Ideas

Lifecycle Mapping: Device Journey Timeline

Provide images of a smartphone at each stage: mining, assembly, use, disposal. In small groups, students sequence cards on a large timeline strip, add notes on environmental impacts, and present one key problem per stage. Conclude with class discussion on prevention.

⏱ 45 min·Small Groups

Generate mission

Waste Audit: Classroom E-Waste Hunt

Students work in pairs to locate and photograph small e-waste items like old cables or batteries around the classroom or school. They categorize by lifecycle stage and estimate landfill impact using provided charts. Groups share findings on a shared digital board.

⏱ 30 min·Pairs

Generate mission

Design Challenge: Modular Gadget Redesign

In small groups, provide cardboard, tape, and recycled materials. Students redesign a simple device, like a toy remote, with swappable parts for longevity. They test prototypes, note sustainability features, and pitch to the class.

⏱ 50 min·Small Groups

Generate mission

Sorting Stations: E-Waste Practices

Set up stations with mock e-waste: batteries, cables, plastics. Whole class rotates, sorting into recycle, repair, or landfill bins while reading labels on Australian recycling rules. Discuss critiques of current systems.

⏱ 35 min·Whole Class

Generate mission

Real-World Connections

Environmental engineers work for companies like Sims Metal Management, developing better ways to sort and recycle electronic waste collected through programs like Drop Zone.

Product designers at companies like Apple or Samsung consider the environmental footprint of their devices, exploring options for using recycled materials and designing for easier disassembly.

Local council waste management centres in cities like Melbourne or Perth manage collections for household hazardous waste, including old computers and televisions, to ensure proper disposal.

Watch Out for These Misconceptions

Common Misconception

Digital devices disappear harmlessly when thrown away.

What to Teach Instead

Devices enter landfills or incinerators, releasing toxins into soil and air. Mapping lifecycles with physical models helps students visualize the full journey and impacts, shifting their view through peer-shared evidence.

Common Misconception

Newer devices are always better for the environment.

What to Teach Instead

Frequent replacements increase mining and waste. Design challenges reveal how repairable features extend life, with group critiques building understanding that sustainability prioritizes durability over novelty.

Common Misconception

Recycling solves all e-waste problems.

What to Teach Instead

Recycling requires energy and misses reduce-reuse priorities. Waste audits show what's truly recyclable locally, guiding discussions on prevention strategies first.

Assessment Ideas

Exit Ticket

Give students a card with a digital device (e.g., tablet, laptop). Ask them to draw and label three stages of its lifecycle and write one sentence about an environmental problem at one of those stages.

Discussion Prompt

Pose the question: 'Imagine you are designing a new tablet. What are two things you would do to make it last longer and create less waste?' Facilitate a class discussion where students share their ideas and explain their reasoning.

Quick Check

Present students with images of different e-waste disposal scenarios (e.g., a landfill, a recycling plant, a device being repaired). Ask students to write a short sentence for each image explaining whether it is a sustainable or unsustainable practice and why.

Frequently Asked Questions

How do I teach the lifecycle of digital devices in Year 3?

Start with a visual timeline using everyday objects: rocks for mining, factory drawings for assembly, your class devices for use, and bin images for disposal. Students add impact sticky notes in small groups. This builds a shared class mural that reinforces stages and connects to personal device use, making the process memorable and sequential.

What strategies make technology last longer?

Teach modular design, like replaceable batteries or screens, and software updates to avoid hardware upgrades. Students explore real examples, such as Fairphone's repairable models. In class, redesign activities with recycled parts show how these cut waste, aligning with sustainable practices in Australia.

How can active learning benefit sustainable tech lessons?

Active methods like e-waste audits and prototype building let students handle materials, simulate lifecycles, and test ideas. This direct engagement reveals hidden impacts, fosters collaboration on solutions, and boosts retention over lectures. Year 3 learners particularly thrive when turning critique into tangible designs.

What are key issues in electronic waste management?

E-waste grows fast in Australia, with low recycling rates for small devices due to collection challenges. Toxins leach from landfills, harming wildlife. Lessons on schemes like TechCollect highlight gaps, prompting student critiques and ideas for better school programs.