Snack Foods

Material Composition Assumptions

The snack food category is highly heterogeneous, spanning potato crisps and corn chips through to pretzels, popcorn, rice cakes, granola bars, and cheese-flavoured extruded snacks. The CCI score of 3.0 kgCO2e/kg represents a weighted average across the high-volume Western snack market, dominated by fried potato-based and corn-based products. Key material inputs for a representative fried potato crisp (the largest category by volume) include:

• Potato or potato starch: Approximately 400–600 g of raw potato are needed per 100 g of finished crisp after frying removes ~80% moisture. Potato is a relatively low-carbon crop (0.2–0.4 kgCO2e/kg raw), but the concentration effect means the agricultural footprint per kg of finished product is 4–6 times higher than for raw potato.
• Vegetable oil (sunflower, palm, rapeseed, or blend): Used for frying, typically representing 25–35% of finished product mass. Palm oil carries variable land-use change risk; sunflower and rapeseed oils from EU sources are generally lower-risk. Oil production and refining contribute approximately 0.3–0.6 kgCO2e per kg of finished product.
• Salt and flavourings: Typically 1–3% of finished mass. Flavour coatings (cheese powder, vinegar, BBQ seasoning) add modest supply chain emissions.
• Packaging (multi-layer flexible film): The primary packaging for crisps is a sophisticated multi-layer laminate — typically biaxially oriented polypropylene (BOPP), metallised PET or metallised BOPP, and a polyethylene sealant layer. A standard 150 g bag uses approximately 8–12 g of laminate film, which at 3.5–5.0 kgCO2e/kg carries roughly 0.04–0.06 kgCO2e per pack. Normalised per kg of product, however, packaging adds 0.6–0.9 kgCO2e/kg — a significant share — because the bags have high surface area relative to product volume and use non-recyclable multi-layer materials.
• Nitrogen gas (MAP): Crisps are nitrogen-flush packed (modified atmosphere packaging) to prevent oxidative rancidity. Industrial nitrogen production from air separation is low-carbon (~0.01 kgCO2e/kg N2) and contributes negligibly to overall footprint.

For grain-based snacks (crackers, pretzels, popcorn), the agricultural input is wheat, corn, or oats, with lower processing energy than frying — partially offset by the need for leavening, seasoning, and more complex flavouring processes.

Why the Score Is What It Is

Snack foods sit at a moderate 3.0 kgCO2e/kg driven by the concentration effect of processing (transforming a high-moisture raw ingredient into a low-moisture, high-calorie finished product) and the packaging intensity of single-serve flexible formats.

Agricultural ingredients (~38% of total) are the largest contributor. The key mechanism is moisture removal: producing 1 kg of potato crisps requires 4–6 kg of raw potatoes. Even at potato’s low raw emission factor (~0.25 kgCO2e/kg), this 5x concentration multiplier means the agricultural burden per kg of finished product (~1.0–1.5 kgCO2e) is substantial. For corn-based snacks (tortilla chips, corn puffs), the concentration ratio is similar; for grain-based (crackers, pretzels) it is somewhat lower because moisture content of wheat flour is already reduced before baking.

Vegetable oil for frying adds approximately 0.3–0.6 kgCO2e/kg of finished product, depending on oil type and origin. Certified sustainable palm oil (RSPO) reduces deforestation risk but does not eliminate the oil’s processing footprint.

Packaging (~28% of total) is the second largest contributor and is disproportionately high relative to the weight of packaging used. Multi-layer flexible films are difficult to recycle in most municipal systems, meaning end-of-life recovery rates are low. The BOPP/metallised PET/PE laminate structure provides necessary barrier properties (moisture, oxygen, light) for shelf-stability but is not currently recyclable at commercial scale in most markets. The industry is transitioning toward mono-material flexible structures (all-BOPP or all-PE) that offer improved recyclability, at some compromise in barrier performance.

Processing energy (~18% Scope 1) for continuous frying is the dominant direct emission source. Batch or continuous industrial fryers operate at 160–185°C using natural gas or steam, consuming 1–2 MJ per kg of finished product in thermal energy. Baked snack alternatives use 30–50% less frying energy but require additional baking steps.

What Drives Variation

Product type drives the widest range within the category. Potato crisps (high oil content, high moisture removal) sit at the upper end: 3.5–5.0 kgCO2e/kg. Baked crackers and rice cakes sit at 1.5–2.5 kgCO2e/kg. Granola bars with nut and honey inclusions can reach 4.0–6.0 kgCO2e/kg depending on nut content (nuts carry higher agricultural footprints than grains). Chocolate-coated snacks inherit a significant footprint from cocoa and dairy ingredients (5.0–8.0 kgCO2e/kg).

Vegetable oil type is a key variable. Products using certified deforestation-free palm oil or European-origin rapeseed oil carry lower LUC risk than products using non-certified palm or soy oils from frontier regions. Replacing palm oil with sunflower or high-oleic sunflower in frying applications typically reduces the oil supply chain footprint by 20–30%.

Pack size significantly affects the packaging footprint per kg of product. Single-serve packets (25–40 g) have 3–5 times more packaging per unit of product than sharing bags (150–200 g), due to the fixed overhead of sealing, label area, and minimum film gauge. Bulk catering packs (1 kg+) have the lowest packaging footprint per kg.

Grid intensity at the manufacturing site affects Scope 2. Large-scale snack manufacturers (PepsiCo Frito-Lay, Mondelez, KP Snacks) have invested in on-site solar, renewable power purchase agreements, and heat recovery from frying to reduce Scope 2 intensity. Frito-Lay’s Casa Grande, Arizona facility is a net-zero-energy operation — the extreme case of what’s achievable with investment.

Distribution distance is a relatively minor contributor because snack foods are ambient-temperature, lightweight products. Air freight is essentially never used. However, export of niche specialty snacks from Europe or Asia to distant markets adds 0.1–0.2 kgCO2e/kg to the system.

Manufacturing Geography

Snack food manufacturing is broadly local-to-regional: proximity to retail markets reduces distribution costs for a category with thin margins per unit weight. Major global producers (PepsiCo Frito-Lay, Mondelez, Intersnack, Lay’s local licensees) operate manufacturing networks in most large consumption markets.

Raw ingredient sourcing is more geographically concentrated. Potatoes are grown in North America, Netherlands, Germany, and the UK as major exporting regions. Palm oil originates primarily from Malaysia and Indonesia. Corn is dominated by US, Brazilian, and Argentine production. These global agricultural supply chains add Scope 3 freight emissions upstream of the snack manufacturing plant.

Grid intensity at manufacturing: EU ~300 gCO2e/kWh (declining with renewable buildout), USA ~390 gCO2e/kWh, India ~700 gCO2e/kWh (large and growing snack market with coal-heavy grid).

Provenance Override Guidance

Manufacturers can override the default CCI score using:

1. Ingredient origin and agricultural practice data per raw material — particularly for potato, vegetable oil type and certification (RSPO for palm), and grain origin.
2. Manufacturing energy audit per facility, specifying fuel consumption per tonne of finished product, electricity consumption, and any renewable energy coverage.
3. Packaging material specifications per SKU — film laminate structure, weight per pack, and recyclability status; any transition to mono-material structures.
4. Supplier LCA data for vegetable oil, particularly documenting deforestation risk and land-use change status.
5. Published corporate sustainability data from major manufacturers with third-party verification of Scope 1, 2, and 3 intensity.

Methodology Notes

• CCI score of 3.0 kgCO2e/kg is a conservative mid-range estimate weighted toward fried potato and corn snacks. The published meta-analysis range (Clune et al. 2017) for this category is 1.5–6.0 kgCO2e/kg depending on product type, ingredient, and packaging.
• Scope breakdown: Scope 3 dominates at ~73% (2.2 kgCO2e), driven by agricultural ingredients and flexible packaging. Scope 1 (frying and process heat) is ~10% (0.3 kgCO2e). Scope 2 (plant electricity) is ~17% (0.5 kgCO2e).
• Functional unit: One kilogram of finished snack food product, cradle-to-gate at the manufacturing plant (retail distribution and consumer use excluded).
• Confidence is medium because the category spans a very wide product range. Agricultural ingredient concentration effects, oil type variability, and packaging footprints all introduce substantial uncertainty.