Coffee — Roasted Beans

Material Composition Assumptions

A representative kilogram of roasted coffee beans begins as approximately 1.19 kg of green (unroasted) coffee beans — the difference represents moisture and volatile compounds lost during roasting (the “roast loss”, typically 15–20% by mass). The full upstream supply chain includes:

• Green coffee beans (Arabica or Robusta): Primary agricultural input. Arabica is grown at altitude in Latin America and East Africa; Robusta in Vietnam and West Africa. Arabica cultivation is generally more land-intensive but uses less synthetic fertiliser per unit than Robusta.
• Fertilisers (N, P, K): Applied at rates of 100–300 kg/ha/year depending on origin country. Nitrogen fertiliser production and soil nitrous oxide (N2O) emissions are significant contributors to farm-level emissions.
• Water (wet processing): Wet-processed (washed) coffees use 30–45 litres of water per kg of parchment coffee, with associated wastewater treatment emissions.
• Drying energy: Sun-drying is common in Ethiopia and parts of Brazil; mechanical drying adds direct energy consumption in high-rainfall origins like Colombia.
• Roasting fuel: Industrial drum roasters typically use natural gas (3–6 MJ/kg roasted); some specialty roasters use electric infrared roasters with higher energy efficiency.
• Retail packaging: Multi-layer foil laminate bags (approximately 50–80 g per kg of product), often not recyclable in standard streams.

The CCI score of 6.5 kgCO2e/kg represents a blended average across Arabica and Robusta origins and includes cultivation, on-farm processing, international transport, roasting, and primary packaging.

Why the Score Is What It Is

Coffee is a moderately carbon-intensive beverage ingredient primarily because of the agricultural footprint at origin, not the roasting process that consumers associate most directly with the product. The 6.5 kgCO2e/kg score is driven predominantly by Scope 3 upstream emissions — over 77% of the total.

Farm-level emissions account for the largest single share (~45%). Synthetic nitrogen fertiliser applied to coffee plants releases nitrous oxide (N2O) from soil at rates that are highly variable but climatically significant (N2O is approximately 265 times more potent than CO2 over a 100-year horizon). Land-use change is a structural risk in coffee, particularly in areas of forest frontier expansion in Brazil’s Cerrado, parts of Ethiopia, and Vietnam’s Central Highlands. Where primary forest is converted to coffee production, lifecycle emissions can be three to five times higher than the baseline estimate shown here.

Processing at origin (wet or dry milling, fermentation, drying) contributes roughly 18% of total emissions. Wet processing requires substantial water and produces organic-rich effluent; dry processing relies on sun-drying or mechanical dryers. The energy mix at origin — predominantly diesel generators and biomass — drives the Scope 1 fraction of processing emissions.

International freight contributes ~14%. Green coffee typically moves by sea container (low carbon per tonne-km), but the long distances from Brazil or Vietnam to European or North American roasters accumulate. Specialty coffees sourced from smaller lots may use airfreight at a premium, which can add 0.5–1.5 kgCO2e/kg to the total.

Roasting itself (12% of total) is surprisingly modest — a well-run gas drum roaster adds approximately 0.6–1.0 kgCO2e per kg roasted, including direct combustion and electricity for airflow and automation. Electric roasters powered by renewable energy can reduce this to under 0.1 kgCO2e/kg.

What Drives Variation

Origin and production system are the largest sources of variability. Brazilian sun-dried Robusta from intensively managed farms can have footprints as low as 4.5 kgCO2e/kg because of low transportation costs within Brazil and efficient mechanised harvesting. Ethiopian washed Arabica from smallholder farms typically sits around 6–8 kgCO2e/kg, with variation driven by fertiliser use and drying method. Vietnamese Robusta tends toward the upper end of the range (7–10 kgCO2e/kg) due to high fertiliser application rates and a carbon-intensive grid for processing.

Deforestation risk is the most extreme source of variation. Coffee grown on recently cleared forest land can carry a land-use change (LUC) penalty of 10–30 kgCO2e/kg — potentially multiplying the baseline score several times over. Supply chain traceability tools and sustainability certifications (Rainforest Alliance, UTZ, Fairtrade) aim to reduce this risk but do not eliminate it.

Roasting geography and energy source matter for the Scope 2 portion. A roaster operating in Norway on near-zero-carbon hydroelectricity versus one in Poland on a coal-heavy grid will see scope 2 emissions differ by a factor of five or more, though this shifts the overall score by less than 0.5 kgCO2e/kg in most cases.

Packaging format affects the score modestly. Single-serve capsules (Nespresso-style) add 2–4 g of aluminium or plastic per serving, which, when normalised per kg of coffee used, can add 0.3–0.8 kgCO2e/kg. Bulk whole-bean supply with minimal packaging sits at the low end.

Organic certification typically removes synthetic fertiliser emissions but does not necessarily reduce overall footprint — yield reductions on organic farms can mean more land is required per unit of output, sometimes resulting in a similar or slightly higher per-kg emission factor depending on the yield gap in a specific origin.

Manufacturing Geography

The default manufacturing region reflects the global coffee trade: origins concentrated in tropical belt (Brazil ~40% of global production, Vietnam ~20%, Colombia ~8%, Ethiopia ~5%), with roasting primarily in consuming markets (EU, USA, Japan).

Green bean transport distances are typically 10,000–18,000 km by sea from origin to consuming-country port. Roasting occurs close to the end market in most cases — large-scale industrial roasters (Nestlé, JDE, Lavazza) operate in the EU and USA using grid electricity and natural gas.

The blended grid intensity for roasting is approximately 300–400 gCO2e/kWh in EU and USA facilities, falling as renewable energy penetration increases. Origin-country grids matter primarily for mechanical processing; Brazil’s predominantly hydroelectric grid (~220 gCO2e/kWh average) is a relative advantage for origin-country processing versus Vietnam (~560 gCO2e/kWh).

Provenance Override Guidance

Manufacturers and importers may override the default CCI score by providing:

1. Farm-level LCA data or verified origin certification demonstrating no deforestation risk (e.g., Rainforest Alliance 2020 standard with verified deforestation monitoring).
2. Fertiliser application records per farm or cooperative, allowing direct substitution of the default N2O emission factor.
3. Processing method documentation specifying wet vs. dry processing, energy source (grid, diesel, biomass, solar), and wastewater treatment method.
4. Freight mode and distance records for green bean shipment — sea vs. air, port of origin to roasting facility.
5. Roasting facility energy data including gas consumption per kg roasted and renewable energy certificates (RECs) covering facility electricity.

Verified supply chain data can reduce the score by 20–40% relative to the conservative mid-range default.

Methodology Notes

• CCI score of 6.5 kgCO2e/kg is a conservative mid-range estimate blending Arabica and Robusta origins, excluding land-use change (which would be additive if applicable). Published peer-reviewed LCA ranges span 3.5–15+ kgCO2e/kg depending on origin, LUC assumptions, and system boundaries.
• Scope breakdown: Scope 3 dominates at ~80% (5.2 kgCO2e), reflecting the agricultural and transport intensity of the supply chain. Scope 1 (roasting fuel) is ~12% (0.8 kgCO2e). Scope 2 (electricity at roasting and processing) is ~8% (0.5 kgCO2e).
• Functional unit: One kilogram of roasted coffee beans, cradle-to-gate at roasting facility (packaging, retail distribution, and consumer brewing excluded).
• Confidence is medium because farm-level emission factors vary significantly with fertiliser rates, processing method, and origin-country grid intensity. ICO and Rainforest Alliance are developing standardised farm-level reporting tools that may improve confidence over time.