Survey focus: feeding people at what cost
Ākonga compare food-production technologies on energy, land, water and resilience rather than on yield alone.
- Applied Survey move: Food-system comparison across four criteria
- Evidence it produces: A conclusion that survives being tested on a criterion it did not favour
Lesson at a Glance | He Tirohanga Whakamua
Ngā Whāinga Ako | Learning Intentions
Students will know
- That monoculture became dominant because it maximises yield and mechanisation efficiency — but creates ecological vulnerability, requires heavy synthetic inputs, and degrades soil health over time.
- That vertical farming can produce food with 95% less water and no pesticides in urban settings — but currently requires significant electricity, has high construction embodied carbon, and is only profitable for premium leafy greens rather than calorie-dense staples.
- That Māori food production systems (māra kai, rāhui, selective kaimoana harvesting guided by maramataka) were inherently kaitiaki systems — managing food relationships over intergenerational timescales rather than maximising single-season yield.
- That "sustainable agriculture" is contested: precision agriculture reduces inputs but preserves monoculture; regenerative farming restores soil but at lower initial yield; food sovereignty movements argue local control of food systems is itself a sustainability requirement.
Students will demonstrate
- By comparing two agritech approaches across three LCA criteria (land use, water, energy) and one kaitiakitanga criterion (whose relationship to land/sea is affected), with a written recommendation for a specific NZ context.
- By writing Design Journal Entry 18: a 3–4 sentence response on what kaitiakitanga-guided food production would look like in their rohe — naming one Māori practice that embodies it, and one way technology could support rather than replace it.
Do Now | Tīmatanga Whakaaro (7 min)
Display on the board — 3 minutes individual, 4 minutes pair discussion:
"What did you eat for dinner last night? Pick two ingredients — where was each one grown? How far did it travel? How many different farms went into your meal?"
Students often can't answer where their food comes from beyond "the supermarket." That invisibility is part of how industrial food systems work — distance from source and production complexity makes it hard for consumers to evaluate the ecological relationship embedded in each meal. An average NZ meal travels thousands of kilometres, grown by a small number of large producers using intensive methods. The design question this lesson asks: what would it look like to redesign that relationship using technology?
Teacher note: For students in rural areas or who come from families with gardens, farms, or connections to kaimoana, this question may be very concrete — some will know exactly where their food comes from. Use this as a positive entry point: what do they know that most NZ students don't? The goal is not to shame urban food disconnection but to surface it as a design problem.
Why Monoculture? | He Aha te Āhua o te Monoculture? (12 min)
Industrial food production became dominant for logical economic reasons — and those same reasons make it structurally resistant to change. Understanding why the system works as it does is prerequisite to designing alternatives that are actually viable.
Why monoculture took over
- Mechanisation: One crop, one machine, one harvest — mechanisation requires uniformity. A diverse polyculture requires hand harvesting or multiple machines.
- Yield maximisation: High-yield monoculture varieties (e.g. IR8 rice, introduced 1966) dramatically increased calorie production per hectare, contributing to reduced famine during the Green Revolution.
- Supply chain integration: Processors and supermarkets need consistent product in large volumes — diversity is a supply chain problem.
- Financial incentives: Banks lend on yield prediction; monoculture is more predictable year-to-year than diverse polycultures.
What LCA reveals about its costs
- Fertiliser dependency: Monoculture depletes soil nitrogen; synthetic fertiliser production (the Haber-Bosch process) accounts for somewhere between 1% and 2% of global CO₂ emissions.
- Pesticide load: Genetic uniformity means one pathogen can destroy an entire crop — pesticide use is a structural requirement, not a choice.
- Biodiversity collapse: Three crops (wheat, rice, maize) provide half of all human caloric intake — profound ecological fragility in a single disease event.
- Soil degradation: Intensive tillage and monoculture degrade soil faster than it re-forms. The FAO estimates 1.66 billion hectares worldwide are degraded by human activity, and more than 60% of that is agricultural land — cropland and pasture.
- Water: Agriculture is the largest water-using sector on earth, taking around 70% of global freshwater withdrawals — much of it for commodity crops grown to feed animals.
- Sources: freshwater withdrawals — FAO AQUASTAT (2025). Land degradation — FAO, State of the World's Land and Water Resources. Haber-Bosch emissions estimates vary by 1.2–2% across the literature depending on system boundary, which is why a range is given rather than a single figure.
NZ context: Intensive dairy farming is the largest single driver of NZ freshwater degradation. The tension between agricultural export revenue and freshwater restoration is one of the defining environmental-economic conflicts of contemporary Aotearoa. Technology that improves efficiency without changing underlying structure may reduce harm-per-unit but not total harm if production scales up.
Video: Why Rice Dominates — Food Sovereignty and Monoculture (8 min)
Why is rice so popular? — TED-Ed (4 min 52 sec)
Rice feeds more than half the world's population. Why did this single crop become so central? What conditions would allow one crop to reach this global scale?
What does the video say about how rice cultivation shaped society? Who has power in rice-based food systems, and who depends on them? What would happen to global food security if rice failed?
If you wanted to introduce a more diverse food system, what would you be working against — not just technically, but culturally and economically? What would it take to redesign something this embedded?
Teacher note: The point of a rice video in an agritech lesson is to make the systemic problem visible before presenting technical solutions. Students who understand WHY monoculture dominates can evaluate whether vertical farming or precision agriculture disrupts the system or optimises within it. A vertical farm growing premium lettuce in Auckland is agritech — but it doesn't change the global rice/wheat/maize dependency. That distinction is the sophisticated analytical move this unit builds toward.
Agritech Alternatives | Ngā Auahatanga Hou (12 min)
Each alternative addresses some costs of industrial monoculture — but none addresses all of them. The dual LCA-kaitiakitanga lens helps identify which approach is appropriate for which context, and what limitations each still carries.
🏢 Vertical Farming
Crops grown in stacked indoor layers using LED lighting, hydroponic or aeroponic systems, climate control, and no pesticides. Currently profitable for leafy greens, herbs, and strawberries — not for wheat, rice, or maize.
LCA wins: 95% less water than field growing, no transport emissions if urban, no pesticides, consistent year-round yield regardless of weather.
LCA gaps: High electricity use (LEDs replace sunlight — the most efficient vertical farms use 4–8x more energy per kilogram than field-grown equivalent). High construction embodied carbon. Currently only viable for premium products in high-income markets.
Kaitiakitanga question: Vertical farming severs the connection between food and land entirely. What is the kaitiakitanga relationship in a system with no soil, no rainfall, and no seasonal rhythm?
🛰️ Precision Agriculture
Using sensors, GPS, drones, and data analytics to apply exactly the right amount of water, fertiliser, and pesticide to each section of a field — reducing total input without changing monoculture structure.
LCA wins: Significant reduction in fertiliser runoff and pesticide use. Water savings of 20–50% on irrigated crops. Reduces the gap between conventional and organic farming in terms of environmental impact per unit produced.
LCA gaps: Still monoculture. Reduces harm-per-unit, but if precision agriculture enables production area expansion, total harm may increase. Requires expensive technology that primarily benefits large commercial operations.
NZ context: Precision dairy (automated milking, pasture measurement) is widely used in NZ. It reduces labour cost and per-cow emissions — but does not address the underlying intensification problem in degraded waterway catchments.
🌱 Regenerative Farming
Farming practices that restore soil health, biodiversity, and ecological function — typically involving diverse cover crops, reduced tillage, composting, and integration of livestock and arable. Moves toward polyculture.
LCA wins: Soil carbon sequestration, reduced synthetic inputs, improved water retention, supports biodiversity including pollinators. Some regenerative farms eliminate net emissions entirely.
LCA gaps: Transition period of 3–7 years sees yield reduction. Requires management complexity that monoculture doesn't. Often requires premium market access to be financially viable.
Kaitiakitanga alignment: Regenerative farming is often described as Western re-discovery of indigenous practices — managing relationships with land rather than extracting from it. The strongest NZ examples involve Māori landowners integrating mātauranga Māori with modern ecological science.
🌿 Māori Food Systems
Traditional Māori food production used diverse strategies — māra kai (cultivated gardens), managed collection of kaimoana (shellfish, fish) under rāhui, selective harvesting of forest foods (berries, birds, fungi), and seasonal management aligned with maramataka (lunar calendar).
Key features: Food production was explicitly kaitiakitanga — rāhui placed on areas to allow recovery, harvest limits set by tohunga to ensure continued abundance, and iwi rights over productive resources enforced and respected across generations.
Contemporary relevance: Māori agribusiness (Tāirawhiti kūmara, Ngāi Tahu's diversified land use, Māori fisheries quota holdings) incorporates kaitiakitanga principles in commercial food production contexts. This is not heritage preservation — it is active food system design informed by intergenerational obligations.
Risk: Romanticising pre-colonial practices without acknowledging that land confiscation (raupatu) destroyed the resource base that made these systems possible. Food sovereignty for Māori requires land and fisheries access, not just knowledge.
Activity: Food System Design for NZ Contexts (10 min)
Recommend a Food Production Approach for a Specific NZ Context
Choose one context from the three below. Recommend one agritech approach (or a combination). Compare it against conventional monoculture on the four criteria in the table. Explain your recommendation in 3–4 sentences.
Coastal area where a high proportion of the land is Māori freehold — far above the national share — with significant kūmara-growing heritage, high unemployment, degraded hill-country from sheep farming, access to coastal kaimoana. Goal: food production that creates local employment and restores the land.
Large secondary school, 2,000 students, significant STEM programme, 400m² of unused rooftop space, school canteen buying produce from central distribution. Goal: supplement canteen with fresh produce, create learning context, reduce food kilometres.
400-hectare intensively-farmed dairy operation on a tributary of the Ōpihi River (endangered braided river ecosystem), under Environment Canterbury monitoring for nitrogen discharge. Goal: maintain profitability while reducing waterway impact to meet consent conditions.
| Criterion | Conventional monoculture | Your recommended approach |
|---|---|---|
| Land use (LCA) | High — large monoculture area, degrades soil over time | |
| Water (LCA) | Very high — irrigation and fertiliser runoff | |
| Energy (LCA) | Moderate — machinery, fertiliser production, transport | |
| Kaitiakitanga relationship | Absent — maximises extraction, no obligation to restore |
📓 Design Journal — Entry 18: Food and Kaitiakitanga in My Rohe
Write 3–4 sentences responding to this prompt:
"What would a kaitiakitanga approach to food production look like in the rohe where you live? Name one Māori practice that embodies it — and one way that modern technology could support that practice rather than replace it."
This entry is about your specific rohe, not a generic answer. If you don't know of a Māori practice relevant to your area, that is itself a useful starting point: why don't you know? What would you need to find out, and from whom?
Exit Claim | Whakamutunga (4 min)
On a slip of paper (anonymous, collected at the door):
"One thing that would have to change in the NZ food system for my Design Journal vision to be possible is ______."
Teacher use: Look for structural answers — land access, political will, economic incentives, consumer behaviour, cultural knowledge transfer — rather than only technical ones. The best responses show that students understand technology is not the only barrier to sustainable food systems; economic and political structures shape which technologies get adopted and who benefits from them.
Kaiako Planning | Ngā Tūāhu Whakaaro
📋 Curriculum Alignment
This lesson addresses the NZ Curriculum Technology strand: Technological Knowledge — Technology and Society — examining how technological systems shape and are shaped by social, economic, and cultural contexts. The analysis of monoculture's historical drivers connects to Social Sciences: Economic World strand. The Māori food sovereignty section connects to Te Mātaiaho's emphasis on mātauranga Māori as a living, evolving knowledge system applied to contemporary challenges.
Science connections: Living World — ecosystems, biodiversity, soil science, food webs. The LCA analysis of monoculture's ecological footprint is direct application of ecological thinking from the Science learning area.
📦 Materials & Resources
- The TED-Ed video (5 min) is accessible and well-made — watch it yourself first to build familiarity with the food systems argument
- Context cards for the design activity — print one per student or display digitally
- Optional extension: the UN Food and Agriculture Organisation (FAO) publishes free annual reports on global food security with NZ-relevant data on freshwater allocation to agriculture
- Optional: Te Tairāwhiti Economic Development website has current information on Māori agribusiness in that rohe — useful if students chose Context A and you want to ground it further
🔄 Differentiation
For students who need more support: Context B (school rooftop garden) is the most concrete and familiar. Provide the recommendation framework pre-filled with vertical farming as the approach, and ask students to complete only the four-criteria table cells and a justification paragraph.
For students who move faster: Research the Māori fisheries settlement — under the 1992 Sealord deal (the Treaty of Waitangi (Fisheries Claims) Settlement Act), Māori received a 50% shareholding in Sealord Products Ltd and 20% of the quota for any new species brought into the Quota Management System. How does quota ownership relate to kaitiakitanga? Does economic ownership of a fishery necessarily mean kaitiakitanga is practised? What would kaitiakitanga fishing governance look like beyond quota allocation?
For students interested in policy: He Waka Eke Noa (a partnership between government, primary-sector industry bodies and Māori agribusiness, developing an alternative to pricing agricultural emissions through the ETS) is a live example of Māori food producers negotiating between economic viability and environmental obligation. What principles guided it, and how does it differ from conventional emissions pricing?
⏭️ Next Lesson Connection
Lesson 19 (Sustainable Technology Design Challenge: Prototyping) transitions students from analysis to synthesis. Students will select one of the sustainable technology domains explored in Lessons 11–18 and design a prototype solution — applying the LCA-kaitiakitanga lens to their own Design Journal context. The Design Journal entries from Lessons 11–18 are the raw material for Lesson 19: which domain most engaged them? Which Design Journal question still feels unresolved? That unresolved question becomes the design brief.