Soil is one of Earth’s largest carbon sinks, second to the ocean. New study discovers a key iron mineral in soil has a nanoscale mosaic of positive and negative charges. Varied charges, hydrogen bonding and strong chemical bonds enable mineral to trap carbon. Findings help explain why some carbon is locked in soils for centuries.

Snow and ice can damage paved surfaces, leading to frost heaves and potholes. These become potential hazards for drivers and pedestrians and are expensive to fix. Now, researchers propose in ACS Sustainable Chemistry & Engineering a figurative and literal green solution to improve the durability of roads and sidewalks: an algae-derived asphalt binder. For temperatures below freezing, results indicated that the algae binder reduced asphalt cracks when compared to a conventional, petroleum-based binder.