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Phenology is the study of recurring lifeâcycle events, classic examples being the flowering of plants and animal migration. Phenological responses are increasingly relevant for addressing applied environmental issues. Yet, challenges remain with respect to spanning scales of observation, integrating observations across taxa, and modeling phenological sequences to enable ecological forecasts in light of future climate change. Recent advances that are helping to address these questions include refined landscapeâscale phenology estimates from satellite data, advanced, instrumentâbased approaches for field measurements, and new cyberinfrastructure for archiving and distribution of products. These breakthroughs are improving our understanding in diverse areas, including modeling landâsurface exchange, evaluating climateâphenology relationships, and making landâmanagement decisions.