This research could help refine estimates of what the atmosphere was like before industrialization. Maybe we’ve been undercounting the world’s aerosol population by overlooking a large portion of those that come from trees. If so, climate models will need retooling.
By quantifying how trees make clouds, scientists could better predict the climate’s future—and past. Industrial emissions reduce some warming through radiative forcing, since sulfur aerosols can create reflective clouds. But if biogenic aerosols were more abundant than expected before industrialization, then the contributions from industry matter less.