Unintended Consequences from Nested State & Federal Regulations: the Case of the Pavley Greenhouse-Gas-Per-Mile Limits
48 Pages Posted: 15 Sep 2009 Last revised: 28 Nov 2024
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Unintended Consequences from Nested State & Federal Regulations: the Case of the Pavley Greenhouse-Gas-Per-Mile Limits
Date Written: September 2009
Abstract
Fourteen U.S. states recently pledged to adopt limits on greenhouse gases (GHGs) per mile of light-duty automobiles. Previous analyses predicted this action would significantly reduce emissions from new cars in these states, but ignored possible offsetting emissions increases from policy-induced adjustments in new car markets in other (non-adopting) states and in the used car market.Such offsets (or "leakage") reflect the fact that the state-level effort interacts with the national corporate average fuel economy (CAFE) standard: the state-level initiative effectively loosens the national standard and gives automakers scope to profitably increase sales of high-emissions automobiles in non-adopting states. In addition, although the state-level effort may well spur the invention of fuel- and emissions-saving technologies, interactions with the federal CAFE standard limit the nationwide emissions reductions from such advances. Using a multi-period numerical simulation model, we find that 70-80 percent of the emissions reductions from new cars in adopting states are offset by emissions leakage.This research examines a particular instance of a general issue of policy significance - namely, problems from "nested" federal and state environmental regulations. Such nesting implies that similar leakage difficulties are likely to arise under several newly proposed state-level initiatives.
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