Geoengineering does little to defuse most of the risks that really matter for people – and it runs the risk of making some harms worse Geoengineering does little to defuse most of the risks that really matter for people – and it runs the risk of making some harms worse P lanetary-scale solar geoengineering interventions involve the deliberate injection of either natural or artificial particulates into the stratosphere – stratospheric aerosol injection, or SAI – with a view to offset some of the