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Currents
December 2018
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be required to design more fuel-efficient cars. Their
reason: climate impacts from forfeited improvements
in fuel economy "would be small, would occur on a
global scale, and would not disproportionately affect
the United States."
Given the vast amount of greenhouse gases that
are emitted around the world, you would not expect
any single climate policy, even major ones, to regis-
ter on the global scale, McCabe says. "Comparing
the impact of any individual policy to global climate
impacts is just not an appropriate thing to do. The
fact that an individual action can be measured to
show any impact on a global metric - that in itself is
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