Abstract

This paper explores the relationships among per capita income, energy consumption, and carbon dioxide (CO 2 ) emissions by focusing on a set of economies at advanced stages of development, the U.S. states. Energy consumption and emissions grew 50-60 percent on average over the 1960-1999 period. The states' per capita energy consumption and emissions have grown on average 2 percent annually. The energy consumption income elasticity is positive but decreasing in income, although energy production takes an inverted- U shape, reflecting the electricity imports among high income states. The standard CO 2 measure, corresponding to energy production, is characterized by an inverted- U environmental Kuznets curve. Adjusting emissions for interstate electricity trade yields an emissions-income relationship that peaks and plateaus. The carbon intensity of energy declines with income for total energy consumption and the industrial, residential, and commercial sectors.

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