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Abstract

Most environmental Kuznets curve (EKC) theories do not apply to carbon dioxide (CO ₂ )—an unregulated, invisible, odorless gas with no direct human health effects. This analysis addresses the hypothesis that the income-CO ₂ relationship reflects changes in the composition of an economy as it develops and the associated role of trade in an emissions-intensive good (e.g., electricity). To test this hypothesis, I use a novel data set of 1960 to 1999 state-level CO ₂ emissions to estimate pretrade (production-based) CO ₂ EKCs and posttrade (consumption-based) CO ₂ EKCs. Based on the first EKC analysis of CO ₂ emissions in the United States, I find that consumption-based EKCs peak at significantly higher incomes than production-based EKCs, suggesting that emissions-intensive trade drives, at least in part, the income-emissions relationship. I have also investigated the robustness of the estimated income-CO ₂ relationship through a variety of specifications. Estimated EKCs appear to vary by state, and the estimated income-emissions relationships could be spurious for some states with nonstationary income and emissions data. Finally, I find that cold winters, warm summers, and historic coal endowments are positively associated with states’ CO ₂ emissions.

Keywords

environmental Kuznets curve greenhouse gas emissions electricity trade cubic spline

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