Simplified version of extreme rain maps (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption These maps show how aerosol and greenhouse gas emissions influence extreme rainfall across the seasons. Green indicates an increase in rain, while brown means a decrease. Greenhouse gases largely increase rainfall across all the seasons, but aerosols work in two ways: the slow impact generally causes drying across the seasons, while the fast impact causes more drying in the winter and spring, and more rain in the summer and fall. Credit Berkeley Lab Usage Restrictions N/A License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.