Aerosol Size and Sunlight Scattering Source 1 - Particle measurements: Fine sulfate particles: diameter 0.4 micrometers; visible-light scattering high Coarse dust particles: diameter 4.0 micrometers; visible-light scattering medium Black carbon particles: diameter 0.2 micrometers; visible-light scattering low; absorption high Source 2 - Model: Some small particles scatter sunlight efficiently, while dark absorbing particles warm the air by absorbing sunlight. Which conclusion best synthesizes the evidence?