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Government policies that are not intended to address environmental concerns can nonetheless distort prices and affect firms' emissions. We present an analytical general equilibrium model to study the effect of distortionary subsidies on factor prices and on environmental outcomes. We model an output subsidy, a capital subsidy, relief from environmental regulation, and a direct cash subsidy. In exchange for receiving subsidies, firms must agree to a minimum level of labor employment. Each type of subsidy and the employment constraint create both output effects and substitution effects on input prices and emissions. We calibrate the model to the Chinese economy, where government involvement affects emissions from both state-owned enterprises and private firms. Variation in production substitution elasticities does not substantially affect input prices, but it does substantially affect emissions.

Zonder onderwerpscode: economie

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Solar geoengineering (SGE) can combat climate change by directly reducing temperatures. Both SGE and the climate itself are surrounded by great uncertainties. Implementing SGE affects learning about these uncertainties. We model endogenous learning over two uncertainties: the sensitivity of temperatures to carbon concentrations (the climate sensitivity), and the effectiveness of SGE in lowering temperatures. We present both theoretical and simulation results from an integrated assessment model, focusing on the informational value of SGE experimentation. Surprisingly, under current calibrated conditions, SGE deployment slows learning, causing a less informed decision. For any reasonably sized experimental SGE deployment, the temperature change becomes closer to zero, and thus more obscured by noisy weather shocks. Still, some SGE use is optimal despite, not because of, its informational value. The optimal amount of SGE is very sensitive to beliefs about both uncertainties.