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This lesson covers the environmental impact of food production, including food waste, packaging and carbon footprint, as required by the AQA GCSE Food Preparation and Nutrition specification (8585), section 3.6.
Food waste is a major environmental and economic problem. In the UK alone, approximately 9.5 million tonnes of food is wasted annually (WRAP data). This waste occurs at every stage of the food supply chain.
| Stage | Examples | Approximate UK Share |
|---|---|---|
| Farm/Production | Crops left unharvested (cosmetic standards reject "ugly" produce); overproduction; weather damage | ~15% |
| Processing/Manufacturing | Trimmings, offcuts, production errors, date-marking waste | ~15% |
| Retail | Unsold products reaching use-by dates; over-ordering; damaged packaging | ~5% |
| Household (consumer) | Cooking too much; not using leftovers; not checking cupboards before shopping; confusion over date marks | ~65% — the largest share |
Exam Tip: The majority of food waste occurs in households, not in shops or factories. This is an important point because it means individual actions can make a significant difference.
| Impact | Explanation |
|---|---|
| Greenhouse gases | Food waste in landfill decomposes anaerobically, producing methane — a greenhouse gas approximately 25 times more potent than CO₂ |
| Wasted resources | All the water, energy, land and labour used to produce the food is also wasted |
| Wasted carbon | The entire carbon footprint of producing and transporting the food is pointless if the food is thrown away |
| Landfill pressure | Food waste takes up significant space in landfills |
| Water waste | Agriculture uses about 70% of global freshwater — wasting food wastes water |
| Strategy | How It Helps |
|---|---|
| Meal planning | Plan meals for the week; write a shopping list; buy only what you need |
| Correct storage | Store food properly to extend its life (correct fridge temperature, sealed containers) |
| Understand date marks | Use-by = safety; best-before = quality. Food past its best-before date is often still good to eat |
| Use leftovers | Turn leftover vegetables into soup; use leftover rice for fried rice; freeze surplus portions |
| Correct portion sizes | Cook the right amount; use measuring tools |
| First In, First Out (FIFO) | Use oldest items first |
| Composting | Compost fruit and vegetable peelings rather than sending them to landfill |
| Food sharing apps | Apps like Olio and Too Good To Go connect people with surplus food |
| "Ugly" vegetable boxes | Services selling cosmetically imperfect produce at reduced prices |
Food packaging serves important functions but also creates significant environmental problems.
| Function | Example |
|---|---|
| Protection | Prevents physical damage during transport and storage |
| Preservation | Modified atmosphere packaging extends shelf life; vacuum packing prevents oxidation |
| Information | Labels provide ingredients, allergens, nutritional info, date marks, cooking instructions |
| Hygiene | Keeps food clean and free from contamination |
| Convenience | Portion sizes, resealable packaging, microwave-safe containers |
| Marketing | Branding, attractive design, promotional information |
| Tamper evidence | Sealed containers show if the product has been opened |
| Material | Advantages | Disadvantages |
|---|---|---|
| Plastic | Lightweight; cheap; versatile; good barrier properties | Non-biodegradable; pollutes oceans; made from fossil fuels; difficult to recycle (many types) |
| Glass | Reusable; recyclable; inert (does not react with food); premium appearance | Heavy (high transport emissions); energy-intensive to manufacture; fragile |
| Metal (aluminium/steel) | Highly recyclable; excellent barrier; lightweight (aluminium); long shelf life for canned food | Energy-intensive to produce from raw materials (though recycling uses much less energy) |
| Cardboard/Paper | Biodegradable; recyclable; renewable resource; lightweight | Not waterproof; less protective; may be lined with plastic (making recycling harder) |
| Biodegradable packaging | Breaks down naturally; made from renewable resources (corn starch, sugarcane) | May require industrial composting; not always accepted in home composting; can be more expensive |
flowchart TD
A["Packaging<br/>Hierarchy"] --> B["REDUCE<br/>Use less packaging"]
B --> C["REUSE<br/>Use containers again"]
C --> D["RECYCLE<br/>Process into new materials"]
D --> E["RECOVER<br/>Energy from waste<br/>(incineration)"]
E --> F["LANDFILL<br/>Last resort"]
style B fill:#27ae60,color:#fff
style C fill:#2ecc71,color:#fff
style D fill:#f39c12,color:#fff
style E fill:#e67e22,color:#fff
style F fill:#e74c3c,color:#fff
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