Eutrophication is the accumulation of nutrients, particularly nitrogen and phosphorus, in freshwater and coastal regions. This can happen naturally -- when nutrients enter the water from rocks, soil, and nearby vegetation -- or through human actions, when nutrients come from sewage, septic systems, agriculture, or industrial wastewater. Watch this SciToons video to understand the process of eutrophication and learn about algae blooms, there causes and how they impact our lives Further resources for video description: Visual Identification of Cyanobacteria Blooms, EPA. https://epa.ohio.gov/static/Portals/28/documents/hab/BloomCharacterizationGuide-DRAFT.pdf Identifying a Harmful Algal Bloom (HAB), California Gov. https://mywaterquality.ca.gov/habs/what/visualguide_fs.pdf How to Identify Harmful Algal Blooms (HABs): Tips and Tricks, New York State DEC. https://www.youtube.com/watch?v=8nL_s77FV-o State HABs resources, EPA. https://www.epa.gov/cyanohabs/state-habs-resources