“Policymakers have raised questions about geoengineering–large-scale deliberate interventions in the earth’s climate system to diminish climate change or its impacts–and its role in a broader strategy of mitigating and adapting to climate change. Most geoengineering proposals fall into two categories: carbon dioxide removal (CDR), which would remove carbon dioxide (CO2) from the atmosphere, and solar radiation management (SRM)" GAO
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