Correlation formulas are developed to estimate the dietary and total greenhouse gas emissions (GHGEs) from Group of Twenty (G20) and the world in 2014 and 2017 using personal meat consumption as the required input. Among the 43 states involved in G20, the 28 states of the European Union (EU28) are considered as a whole. Based on 47,381 dietary survey samples, a formula is developed to establish the relationship between the meat consumption and GHGEs from human dietary and total activities.