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OBJECTIVE This paper examines the relationship between obesity and greenhouse gas (GHG) emissions while accounting for the environmental impact of growth in transportation output and in crop and animal farming. STUDY DESIGN The study makes use of US state-level longitudinal data over the 1997-2011 period. METHODS Random effects and fixed effects estimators are employed within a multiple regression analysis framework. RESULTS After controlling for other sources of emissions, there is evidence that the effect of transportation output on CO2 emissions worsens at obesity rates exceeding 33.7% and the effect on N2O emissions worsens at obesity rates exceeding 22.5%. In addition, the impact of crop and animal farming on N2O emissions worsens at obesity rates exceeding 20.2%. CONCLUSION This paper provides significant and new insight about the causal link between obesity and environmental emissions and highlights the importance of addressing the obesity epidemic on public health and environmental grounds. Thus, mitigating GHG emissions connected to obesity requires joint effort between policymakers, public health officials, and parties from concerned economic sectors in pursuing remedial actions to reverse the current obesity trend. Various policy measures are discussed.