Does Economic Policy Uncertainty Affect CO2 Emissions? Empirical Evidence from the United States

This paper aims to examine the effects of economic policy uncertainty (measured by the World Uncertainty Index—WUI) on the level of CO 2 emissions in the United States for the period from 1960 to 2016. For this purpose, we consider the unit root test with structural breaks and the autoregressive-distributed lag (ARDL) model. We find that the per capita income promotes CO 2 emissions in the long run. Similarly, the WUI measures are positively associated with CO 2 emissions in the long run. Energy prices negatively affect CO 2 emissions both in the short run and the long run. Possible implications of climate change are also discussed.