Methane Needs a Second Metric in Meat-Sector Climate Reporting

Corporate greenhouse-gas inventories often compress very different emissions into a single carbon-dioxide-equivalent figure. A new paper published in Frontiers in Climate proposes that livestock and meat companies retain GWP100 reporting but complement it with GWP* for biogenic methane. The purpose is to better reflect how changes in methane emissions relate to warming over time.

The proposal does not replace existing reporting frameworks. It calls for dual reporting: carbon dioxide and nitrous oxide would remain under GWP100, while enteric and manure methane would also be shown using GWP*. To prevent a lack of company history from blocking calculation, the authors describe a “shadow company” built from national emissions data for the twenty years before the reporting baseline.

Methodological discipline matters here. The study requires biogenic methane to be separated from other gases and cautions against confusing carbon-dioxide equivalent with carbon-dioxide-warming equivalent. It also makes clear that sustained methane increases can look worse under GWP*; this is not a tool for automatically lowering reported figures.

For meat companies with climate targets, the contribution is chiefly managerial. If the approach gains traction, sourcing decisions, baseline selection and the geographical origin of cattle will carry more weight in climate communication. The sound practice remains transparent publication of assumptions, methods and both metrics.