Sheep in a Field Surrounded by Methane Molecules (image) DOE/Joint Genome Institute Share Print E-Mail Caption The U.S. Environmental Protection Agency attributes one-fifth of methane emissions to livestock such as cattle, sheep and other ruminants. However, not all ruminants are equal when it comes to greenhouse gas emissions. It turns out that the amount of methane produced varies substantially across individual animals of the same ruminant species. Credit Sheep image courtesy of AgResearch – Gerry le Roux, Sciencelens. Art by Wayne Keefe, Berkeley Lab Creative Services. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.