Summary
Agriculture is a significant source of anthropogenic greenhouse gas (GHG) emissions, and beef cattle are particularly emissions intensive. GHG emissions are typically expressed as a carbon dioxide equivalent (CO<sub>2</sub>e) 'carbon footprint' per unit output. The 100-year Global Warming Potential (GWP<sub>100</sub>) is the most commonly used CO<sub>2</sub>e metric, but others have also been proposed, and there is no universal reason to prefer GWP<sub>100</sub> over alternative metrics. The weightings assigned to non-CO<sub>2</sub> GHGs can differ significantly depending on the metric used, and relying upon a single metric can obscure important differences in the climate impacts of different GHGs. This loss of detail is especially relevant to beef production systems, as the majority of GH
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