Map showing estimated methane emissions using a "gridded" approach Image: Penn State
The researchers estimated methane emissions using a "gridded" approach, dividing the U.S. into 0.1- by 0.1-degree GIS units. The study pegged total U.S. livestock methane emissions of 19.6 billion lb. per year. This map shows where they are coming from.

N&H TOPLINE: Uncertainty surrounds U.S. livestock methane estimates

Great uncertainty exists in both enteric and manure methane emissions from livestock.

Following the American Chemical Society's release of a new study of methane emissions from livestock in the U.S., Pennsylvania State University researchers have provide additional details about the study, which has challenged previous top-down estimates.

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