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Related Experiment Video

Updated: Jun 4, 2025

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Published on: September 7, 2019

Impact of solar geoengineering on temperature-attributable mortality.

Anthony Harding¹, Gabriel A Vecchi^2,3, Wenchang Yang²

¹School of Public Policy, Georgia Institute of Technology, Atlanta, GA 30032.

Proceedings of the National Academy of Sciences of the United States of America

|December 17, 2024

Summary

This summary is machine-generated.

Solar geoengineering (SG) could reduce global deaths from warming, but impacts vary by region. Quantitative analysis suggests benefits likely outweigh direct risks, though uncertainties remain.

Keywords:

human mortality risk–risk analysis solar geoengineering

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Area of Science:

Climate science
Environmental economics
Public health

Background:

Solar geoengineering (SG) decisions involve balancing its risks against climate risks.
Quantitative comparisons are crucial for informed public policy on climate interventions.

Purpose of the Study:

To evaluate SG's effectiveness in reducing warming-related mortality.
To conduct the first quantitative risk-risk comparison of SG's benefits and direct risks.

Main Methods:

Utilized two climate models and econometric analysis of temperature-attributable mortality.
Integrated mortality estimates with existing data on direct SG risks (air quality, UV-cancer).

Main Results:

SG's mortality impact is uneven: reductions in hotter, poorer regions; increases in cooler, richer areas.
A 1°C cooling via SG could reduce global annual mortality by over 400,000 deaths.
Estimated a 61% probability that mortality benefits outweigh direct risks, with benefits 13 times greater in central estimates.

Conclusions:

SG offers potential mortality benefits that may outweigh its direct risks, but regional impacts differ.
This study provides a foundational quantitative risk-risk assessment for SG, highlighting areas for further research.
Despite robust findings, significant uncertainties necessitate continued investigation into SG's complex tradeoffs.