Frequently Asked Questions
What is the carbon footprint of olive oil?
The carbon footprint of olive oil is estimated at approximately 3–4 kg CO2-equivalent per liter of extra virgin olive oil produced — though this estimate varies significantly based on farming practices (organic vs. For a complete overview, see our Extra Virgin Olive Oil guide.conventional, irrigation method), processing (traditional vs. modern centrifugal extraction), packaging (glass vs. tin vs. plastic), and transportation distance. For comparison, olive oil's footprint is lower than butter (approximately 14 kg CO2e/L), comparable to rapeseed/canola oil (2–4 kg CO2e/L), and higher than soybean oil (approximately 2 kg CO2e/L) on a per-liter basis. However, olive oil is used more sparingly (30–45mL per person daily for Mediterranean diet benefits versus 50–100mL for cooking oils), meaning the per-serving footprint is lower than these comparisons suggest.
The largest contributor to olive oil's carbon footprint is farming operations (fertilizers, irrigation, Harvest labor), accounting for approximately 40–50% of total lifecycle emissions. Processing (pressing, centrifugation, storage) accounts for approximately 20–30%, packaging for 10–20%, and transportation for 5–15% depending on distance. The olive tree's carbon sequestration capacity — olive groves sequester approximately 10–15 tonnes CO2e per hectare annually in the biomass and soil — substantially offsets production emissions when calculated on a full lifecycle basis, making olive oil a relatively climate-friendly fat compared to industrially produced vegetable oils. 1
The Olive Tree's Carbon Sequestration Advantage
Olive trees are among the most climate-resilient perennial crops in the Mediterranean — they are drought-tolerant, thrive in marginal soils unsuitable for annual crops, live for centuries, and sequester significant carbon in their woody biomass and the soil beneath them. A mature olive grove (50–150 trees per hectare, depending on spacing) sequesters approximately 10–15 tonnes of CO2-equivalent per hectare annually in above-ground biomass (trunks, branches, leaves) and below-ground root systems. This sequestration substantially offsets the production emissions of olive oil, making the net carbon footprint of sustainably produced olive oil considerably lower than annual row crops like soybeans or corn.
The soil carbon sequestration under olive groves is particularly significant — the permanent ground cover (spontaneous vegetation or cover crops between rows) builds soil organic matter over decades, and the absence of annual tillage in traditional olive groves preserves soil carbon stocks that would otherwise be released. Traditional olive groves (often on slopes, with centuries-old trees) have accumulated substantial soil carbon over hundreds of years of cultivation — this long-term storage means that replacing traditional olive groves with intensive conventional orchards releases historically accumulated soil carbon, a debt that takes decades of sustainable management to repay. This is one reason why converting traditional olive groves to high-density conventional plantations is controversial from a climate perspective. 2
Where Emissions Occur in Olive Oil Production
Farming (40–50% of total footprint)
Nitrogen fertilizers — particularly synthetic ammonium nitrate — have the highest carbon footprint of any agricultural input, accounting for 30–40% of farm-level emissions. The Haber-Bosch process that synthesizes ammonia for fertilizer is extremely energy-intensive (requiring natural gas as both feedstock and energy source). Organic olive farming reduces this component substantially by replacing synthetic fertilizers with compost and cover crops. Irrigation pumping (particularly for groundwater-fed drip irrigation in Spain and Italy) accounts for 15–25% of farm emissions — switching to rain-fed cultivation or optimizing irrigation scheduling reduces this significantly. Harvest (hand-picking versus mechanical harvesting) contributes relatively little directly but influences labor costs and fruit damage that affects processing energy requirements.
Processing (20–30% of total footprint)
Olive oil extraction is energy-intensive — the two-phase or three-phase centrifugation system requires substantial electricity for motors spinning at high RPM, plus thermal energy for heating the paste to optimize oil yield. Modern continuous centrifugal extractors (the current standard) use approximately 0.5–1.0 kWh per 100kg of olives processed. The energy source matters — in Spain and Italy, grid electricity has a significant fossil fuel component, making processing emissions higher than in regions where grid electricity is predominantly renewable. Some mills are now using solar PV to power their extraction operations, substantially reducing processing emissions.
Packaging and transportation (15–25% of total footprint)
Glass bottles have a higher carbon footprint than tin containers due to the energy intensity of glass manufacturing (approximately 3–4× higher CO2 per equivalent volume). However, glass is more recyclable than tin (which has lower but non-zero recycling rates). The weight of packaging also affects transportation emissions — heavier glass bottles generate more CO2 per liter during transport than lightweight tin. For the lowest combined footprint, choose olive oil in tin containers from nearby producing regions (Spain and Italy to US markets) rather than heavy glass from distant origins. 1
How to Choose Lower-Carbon Olive Oil
The most impactful consumer choice for reducing olive oil's carbon footprint is choosing products with transparent production practices — ask producers about their farming methods, energy sources for processing, and packaging choices. Look for organic certification (which eliminates synthetic fertilizer emissions), tin or recyclable packaging, and products shipped by sea rather than air freight (which has 50–100× higher carbon intensity). Buying in bulk (3L or 5L tins rather than multiple 500mL bottles) reduces per-liter packaging and transportation emissions.
The Mediterranean diet framework naturally reduces the carbon footprint of food choices — the emphasis on local, seasonal, and plant-forward eating with olive oil as the primary fat aligns with low-carbon eating patterns. Compared to a Western diet with butter, cream, and soybean oil, Mediterranean diet with olive oil has a substantially lower food-system carbon footprint even before considering olive oil's specific production practices. When olive oil is consumed as part of the broader Mediterranean eating pattern, its per-meal carbon impact is modest — the benefit of displacing higher-footprint fats (butter, cream, palm oil, soybean oil) more than offsets its own production footprint. For climate-conscious consumers, olive oil in a Mediterranean dietary pattern is one of the most climate-friendly fat choices available. 2
References
- [1] Olive oil anti-inflammatory properties — https://pubmed.ncbi.nlm.nih.nih/6770785/
- [2] Mediterranean diet benefits on health and mental health — https://pubmed.ncbi.nlm.nih.gov/34358723/