Analysis of Nordhaus' work, a modeling framework that set several industry standard components for carbon tax analysis. From this work many have drawn the conclusion that an efficient global emissions abatement policy comprises modest and modestly increasing controls. On the contrary, this report provides an initial illustration that, if the analysis is extended to take more strongly into account three essential elements of the climate problem – the endogeneity of growth, the convexity of damages, and climate risk – optimal policy comprises strong controls.