Eutrophication is a process where excess nutrients in water lead to harmful effects like algae blooms. The nutrients come from sources like agriculture and sewage. This causes problems like low oxygen levels and fish die-offs. Eutrophication can also impact the economy and society. Scientists can predict and model these effects. To fix this, we need to reduce nutrient sources and manage the impacts. The Norfolk Broads in the UK show that restoring lakes can help combat eutrophication.