RedOrbit: Researchers study water cycle and cloud formation and design computer algorithm models to understand impact In the past, many atmospheric scientists believed that pollen particles probably had a negligible effect on climate because they were so big. In recent years, however, as they began to realize that pollen particles were not as sturdy as they once thought, they have been rethinking their old assumptions. Pollen can rupture and generate a lot of small, tiny particles, says Allison Steiner,...