This paper uses a benchmark climate model with endogenous technical change to consider the effects of three extensions on optimal policy under a clean transition. First, the movement of workers between non-energy and energy sectors lowers the cost of abatement by more than an order of magnitude,...

The framework used to endogenise technology growth by Acemoglu, Aghion, Bursztyn, and Hemous (2012), hereafter AABH, allows the existence of unstable equilibria and does not provide a rationale for specifying which equilibrium should apply when more than one exists. This paper: (i) suggests a...