Livestock like cows and pigs produce methane, a potent greenhouse gas. New research shows that previous estimates of how much methane these animals emit were too low. By updating the information used to calculate these emissions, scientists found that global livestock methane emissions in 2011 were actually 11% higher than previously thought. This increase is mainly due to changes in how animals are fed and managed. The revised estimates suggest that livestock methane emissions have been a significant factor in the overall rise in methane levels in recent years. These findings will help improve our understanding of how livestock contribute to climate change and will aid in developing better models to assess environmental impacts.