Is salmon really much better for the environment than beef?

On average, beef has a carbon footprint about 14 to 20 times larger than salmon. Beef produces ~99kg CO2e per kg, while salmon produces ~5kg CO2e.

Does it matter how salmon is transported?

Air-freighting fresh salmon significantly increases its footprint. To keep emissions low, choose frozen salmon or salmon transported by ship or truck.

Is wild-caught salmon better than farmed salmon for the carbon footprint?

Wild-caught salmon often has a slightly lower footprint than farmed salmon, but this depends on the distance the boat travels. Sustainable farming practices are also narrowing the gap.

Why is the beef carbon footprint so high?

Cattle are ruminants that belch methane, a potent greenhouse gas. They also require vast amounts of land and feed compared to fish.

food

Salmon vs Beef: Carbon Footprint Compared

Comparing the greenhouse gas emissions of two popular proteins.

April 13, 2026

Salmon (Farmed)

5.1kg CO₂e

kg CO2e per kg product

Beef (Bovine Meat)

99.4kg CO₂e

kg CO2e per kg product

Lower footprint: Salmon

Overview of Salmon vs Beef Carbon Footprint

When deciding what to put on your dinner plate, the choice between salmon vs beef carbon footprint is one of the most impactful decisions you can make for the planet. As climate awareness grows, many consumers are looking for ways to reduce their dietary greenhouse gas emissions without sacrificing protein.

Beef is widely recognized as the most carbon-intensive protein in the global food system due to methane emissions and land use. Salmon, whether wild-caught or farmed, generally offers a much lower carbon profile. This comparison dives into the data to show how switching from red meat to fish can significantly shrink your personal carbon footprint.

The Numbers: Salmon vs Beef Carbon Footprint

When we compare these two proteins, the difference is not just a small margin—it is an order of magnitude. According to data from the comprehensive study by Poore & Nemecek (2018), the life-cycle assessment of these products reveals a startling gap.

Beef (Beef Herd): On average, producing 1 kilogram of beef results in approximately 99.48 kg of CO2e. Even the most "efficient" beef production systems typically hover around 60 kg of CO2e per kg.
Farmed Salmon: Producing 1 kilogram of farmed salmon results in approximately 5.1 kg to 7.2 kg of CO2e.
Wild-Caught Salmon: This can vary between 3 kg and 5 kg of CO2e, largely depending on the fuel efficiency of the fishing vessel.

In short, eating one kilogram of beef creates roughly 14 to 20 times more greenhouse gas emissions than eating the same amount of salmon.

Why the Difference?

Understanding why the salmon vs beef carbon footprint gap is so wide requires looking at how these animals live and what they consume.

1. Methane and Enteric Fermentation

The primary driver for beef's high footprint is "enteric fermentation." Cattle are ruminants; their digestive process produces methane, a greenhouse gas that is roughly 28–80 times more potent than CO2 over a 100-year and 20-year period, respectively. Salmon, as fish, do not produce methane.

2. Feed Conversion Ratio (FCR)

FCR measures how many kilograms of feed are required to produce one kilogram of body mass. Salmon are incredibly efficient: they are cold-blooded and live in a buoyant environment, meaning they don't burn energy to maintain body temperature or fight gravity.

Salmon FCR: ~1.2 to 1.5
Beef FCR: ~6.0 to 10.0 Because beef requires so much more feed, it requires vastly more land for crops (soy, corn) and pasture, leading to deforestation and high N2O emissions from fertilizers.

3. Land Use and Biodiversity

Beef production is the leading driver of global deforestation, especially in the Amazon. Salmon production avoids direct land use for grazing, though farmed salmon does rely on terrestrial crops for feed. However, the sheer scale of land required for a cow compared to a fish is incomparable.

4. Logistics and Air Freight

One important caveat for salmon: how it travels matters. If you buy fresh salmon that has been air-freighted across the globe, its carbon footprint can triple or quadruple, sometimes rivaling chicken or pork. Frozen salmon, which travels by sea, maintains its low-carbon status.

What You Can Do

If you want to lower your impact while still enjoying these proteins, consider these steps:

Swap Beef for Salmon: Replacing just one beef meal per week with salmon can save over 500kg of CO2e per year for an individual.
Check the Transport: Buy frozen salmon or locally sourced fish. Avoid "fresh" salmon if it had to be flown to your location (look for "air-freighted" labels or ask your fishmonger).
Look for Certifications: For farmed salmon, look for the ASC (Aquaculture Stewardship Council) label. For wild salmon, look for the MSC (Marine Stewardship Council) to ensure sustainable population management.
Mind the Portions: Reducing portion sizes of beef and treating it as a "side" or a rare treat rather than a staple is an effective way to transition your diet.

Ready to see how your specific diet impacts the planet? Calculate your own carbon footprint here.

Curious about your own footprint?

Calculate yours →

FAQ

Is salmon really much better for the environment than beef?: On average, beef has a carbon footprint about 14 to 20 times larger than salmon. Beef produces ~99kg CO2e per kg, while salmon produces ~5kg CO2e.
Does it matter how salmon is transported?: Air-freighting fresh salmon significantly increases its footprint. To keep emissions low, choose frozen salmon or salmon transported by ship or truck.
Is wild-caught salmon better than farmed salmon for the carbon footprint?: Wild-caught salmon often has a slightly lower footprint than farmed salmon, but this depends on the distance the boat travels. Sustainable farming practices are also narrowing the gap.
Why is the beef carbon footprint so high?: Cattle are ruminants that belch methane, a potent greenhouse gas. They also require vast amounts of land and feed compared to fish.