Climate econometric models indicate solar geoengineering would reduce inter-country income inequality

Area of Science:

• Climate Science
• Environmental Economics
• Macroeconomic Modeling

Background:

• Understanding the economic consequences of solar geoengineering is crucial for assessing its risks.
• Macroeconomic models widely used for climate change impacts are applied to solar geoengineering scenarios.

Purpose of the Study:

• To evaluate the economic impacts of solar geoengineering and greenhouse gas-driven climate change on equal terms.
• To project socio-economic outcomes under different climate scenarios using macroeconomic models.

Main Methods:

• Utilized macroeconomic impact models, historical data, and climate simulations of temperature and precipitation.
• Assessed stylized climate scenarios involving stabilized or over-cooled global temperatures via solar radiation management.
• Projected socio-economic outcomes under high anthropogenic emissions.

Main Results:

• Economic impacts on global GDP per capita by century's end are primarily temperature-driven, highly dispersed, and model-dependent.
• Solar geoengineering consistently reduces income inequality between countries across all model specifications.
• Findings highlight the distributional effects of solar geoengineering.

Conclusions:

• Solar geoengineering presents a potential pathway to mitigate adverse economic impacts of climate change.
• The reduction in inter-country income inequality is a significant finding for geoengineering ethics and governance debates.
• Further research into the heterogeneous economic impacts is essential for informed decision-making.