Abstract
US economic growth and air pollution were decoupled after 1970. Possible explanations include regulation, oil price shocks, technology and income growth. This paper uses VAR analysis to show that the 1970 Clean Air Act (CAA) may have actually increased pollution in the short run but led to accelerated improvements in abatement technology. Gross domestic product and consumption growth had little direct effect while oil price increases caused small but significant emissions reductions. Recursive simulation shows that overall, the CAA, by accelerating improvements in abatement technology, reduced total emissions as of 1998 to 46% of what they would have been.
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