Chap 3 Eutrophication and Red tide 3.1 What is Eutrophication?(definition) 3.2 Why should we be concerned? (harmful effect 3. 3 The nutrient in the coastal seawater 3.4 Eutrophication in the coastal seawater 3.5 HABs and red tideChap.3 Eutrophication and Red tide 3.1 What is Eutrophication? (definition) 3.2 Why Should We Be Concerned? (harmful effect) 3.3 The nutrient in the coastal seawater 3.4 Eutrophication in the coastal seawater 3.5 HABs and Red tide