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Why can small-scale geoengineering experiments reveal little about global-scale effectiveness?

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Illustration of various geoengineering techniques to address climate change, including carbon capture and storage methods like artificial trees, industrial scrubbers, and deep ocean CO2 storage, as well as solar reflectance strategies such as sulfur aerosols, reflective crops, cloud whitening, and orbital mirrors. The scene shows these interventions applied to land, sea, and atmosphere, with labeled features explaining each process. — Geoengineering Various geoengineering proposals designed to increase solar reflectance or capture and store carbon.

Small-scale experiments in geoengineering are often considered insufficient for predicting global-scale effectiveness because the Earth's climate is a complex, interconnected system that is not yet fully understood.1

Because geoengineering aims to manipulate global processes—such as solar radiation reflectance or greenhouse gas concentrations—the scale of these interventions is fundamentally different from localized weather modification like cloud seeding. Deploying technologies at a global level involves immense complexity, high costs, and significant risks of unintended consequences that cannot be captured by limited pilot studies.12

Furthermore, because no proposed global scheme has been purposefully tested, there is a lack of empirical data regarding the safety, efficiency, and long-term impacts of these interventions on the planet. Consequently, scientists emphasize that rigorous evaluation is essential before any implementation, as small-scale trials simply cannot replicate the planetary-scale dynamics required to determine if a proposal will successfully mitigate climate change.12