The current study empirically investigates and shows that, on average, the possible implementation of the Transatlantic Trade and Investment Partnership (TTIP) would generally help in the fight against global warming. In particular, the study finds that a 1% increase in the bilateral trade between the United States and the typical EU member would reduce annual per capita emissions ofCO2andGHGsin the typical TTIP member by about 2.7% and 2.4%, respectively. However, results also show that TTIP may increase annual per capita emissions ofGHGsin the United States by about 2.5% per year. These results stand because the factor endowment hypothesis and the pollution haven hypothesis based on population density variations appear to dominate the pollution haven hypothesis based on national income differences.