Suppose that a natural gas power plant emits carbon emissions (E) as a byproduct of electricity generation. Marginal damages are given by 4E. The power plant's marginal abatement costs are given by 20 āˆ’ E. Furthermore, suppose that the regulator does not know the power plant's MAC, but estimates it to be 15 āˆ’ E. What level of emissions will the natural gas power plant emit in the absence of regulation? Illustrate the unregulated equilibrium on a graph.