Some empirics on the convergence of carbon dioxide emissions intensity across US states

This study examines the convergence of carbon dioxide emissions intensity across the 50 US states including the District of Columbia over the period 1997-2013 using a battery of tests. The results from cross-sectional tests of beta- and sigma-convergence lend support for overall convergence in carbon dioxide emissions intensity. On the other hand, panel unit root tests with allowance for endogenous structural breaks reveal that relative carbon dioxide emissions intensity contains a unit root, hence the absence of stochastic convergence.