Solar geoengineering aims to cool the planet by reflecting sunlight.
Stratospheric aerosol injection (SAI) is a key strategy in this field.
Carbon impurities in diamonds challenge the effectiveness of SAI.
Briefing: Diamonds are not a geoengineer's best friend: Carbon impurities provide a reality check
Strategic angle: Exploring the implications of carbon impurities in diamonds on solar geoengineering strategies.