Carbon footprint of milk higher than thought?

What changed in milk’s carbon footprint estimate

A life-cycle assessment suggests milk’s carbon footprint could be materially higher than some earlier calculations—potentially by about 41%—when soil effects are modeled more fully.

The key driver: soil organic carbon shifts

The new analysis points to a limitation in standard greenhouse-gas accounting methods that follow IPCC guidance. Those methods can underestimate emissions when agricultural soils experience changes in their stored carbon.

In particular, the study highlights a mechanism common in colder regions: freeze–thaw cycles. As climates shift, agricultural areas—especially in northern zones—can see soils undergo more frequent or intense freeze–thaw events. The researchers found that these cycles can reduce how much carbon soils store over time.

Why this matters for climate policy

Milk is a widely consumed, high-emission food component because livestock supply chains include methane from animals and energy use across farming and processing. But the soil piece can be significant, because it affects whether land acts as a carbon sink or a source.

If soil carbon losses are larger than previously assumed, then mitigation efforts that rely on older footprint baselines may underestimate the climate impact of dairy production.

Practical takeaway

The result doesn’t mean every farm will behave identically—soil type, management, and local weather patterns will determine the magnitude—but it does suggest current reporting frameworks may miss important emissions pathways. As climate strategies increasingly move toward product-level carbon accounting, improving soil-carbon representation could change how dairy’s footprint is measured and compared to alternatives.