Better clean or efficient? Panel regressions.

Most national and international climate agendas promote energy efficiency and fossil to renewable energy substitution as key future policy directions. This paper surveys macro-energy-emission-output panel assessments and shows that previously estimated carbon response functions present diverging shapes with less evidence on the confounding role of development. This study applies a multivariate regression equation and both Pesaran (1995) and Pesaran (2006) mean group estimators with common correlated effects to illustrative samples of countries with data covering five decades. For all groups, long-run panel coefficients show that energy efficiency improvements associate with larger negative carbon responses than fossil-to-renewable energy shifts. Estimates derived from high-income economies are much smaller in magnitude and significance compared to those of developing countries, which is further corroborated by country-level parameters. This implies that least-energy efficient and -green economies can benefit from a wider set of carbon abatement policies. [ABSTRACT FROM AUTHOR]