Walnuts carbon footprint

2.4 kg CO2e per kg (about 0.24 kg CO2e per 100g) — compare with similar foods below.

Low-Medium ImpactPlant Proteins

2.4

kg CO2e / kg

9,063

litres water / kg

m² land / kg

15g

protein / 100g

Per Serving

Serving size: 50g (handful (50g))

CO2 per serving: 0.12 kg CO2e

CO2 per 100g: 0.24 kg CO2e

What does 2.4 kg CO2e mean?

Producing 1 kg of Walnuts generates the same CO₂ as driving a petrol car for approximately 14 km, or charging a smartphone 292 times. These are global average figures — actual values vary by country, farming method, and supply chain.

Walnuts vs Other Plant Proteins

How does Walnuts compare to other foods in the Plant Proteins category?

Walnuts

2.4

kg CO2e per kg — lower is better

Lower-Carbon Alternatives

Foods with a lower carbon footprint you could consider instead.

Watermelon

Fruits

0.3kg CO2e/kg-88%

Carrots

Vegetables

0.4kg CO2e/kg-83%

Apples

Fruits

0.4kg CO2e/kg-83%

Potatoes

Vegetables

0.5kg CO2e/kg-79%

Onions

Vegetables

0.5kg CO2e/kg-79%

Methodology and data sources

Values are lifecycle-style estimates (farm to retail gate, typical global production mix), consistent with meta-analyses such as Poore & Nemecek (2018) and summaries like Our World in Data — environmental impacts of food. Your country, brand, and cooking method can shift real impacts; use comparisons on this page for directional choices, not exact accounting.

Browse the full food carbon database · Diet carbon calculator.

Frequently Asked Questions

How much CO2 does Walnuts produce?

Walnuts produces approximately 2.4 kg of CO2 equivalent per kilogram. Per typical serving (50g / handful (50g)), that's about 0.12 kg CO2e.

Is Walnuts bad for the environment?

Walnuts has a relatively low carbon footprint at 2.4 kg CO2e/kg, making it a more climate-friendly food choice.

How much water does producing Walnuts require?

Producing 1 kg of Walnuts requires approximately 9,063 litres of water. This includes irrigation, processing, and supply chain water use.

What are lower-carbon alternatives to Walnuts?

Lower-carbon alternatives include Watermelon (0.3 kg CO2e/kg), Carrots (0.4 kg CO2e/kg), Apples (0.4 kg CO2e/kg). Switching to these can significantly reduce your dietary carbon footprint.