Climate impacts of alternative beef production systems depend on the functional unit used: Weight or monetary value

Summary

This meta-analysis of 32 North American beef production studies (2001–2023) reveals substantial variation in greenhouse gas emissions (10.2–37.6 kg CO₂e/kg carcass weight) and highlights a critical methodological issue: the choice of functional unit—weight versus monetary value—significantly alters climate assessments of alternative production systems. The authors report that soil carbon sequestration offers the greatest mitigation potential (80%), and that grass-finished beef exhibits lower carbon intensity per pound sterling or dollar spent, despite higher emissions per kilogramme, challenging conventional weight-based comparative claims. The findings emphasise the importance of incorporating land use, management effects, and soil carbon dynamics in beef production climate assessments.

UK applicability

UK beef producers and policymakers should consider these findings when evaluating domestic production systems against imports, particularly regarding methodological choice of metrics (weight vs. economic value) and the significant role of soil carbon sequestration in climate accounting. However, direct application requires calibration to UK production contexts, environmental conditions, and market structures, which differ from North American systems.

Key measures

Greenhouse gas emissions (kg CO₂e per kg carcass weight and per monetary unit); soil carbon sequestration potential; mitigation contributions by technology type (growth enhancement, diet modification, grazing management)

Outcomes reported

The study quantified variation in greenhouse gas emissions from North American beef production across 32 studies (2001–2023), reporting a fourfold range (10.2–37.6 kg CO₂e/kg carcass weight) and comparing mitigation potential of soil carbon sequestration, growth technology, diet modification, and grazing management. The research demonstrated differential climate performance when comparing production systems using weight-based versus monetary-value metrics, with grass-finished beef showing lower carbon intensity per economic unit despite higher emissions per kilogramme.

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