Overview
Eutrophication is the ecological process where excessive nutrients, primarily nitrogen and phosphorus, accumulate in a body of water. This nutrient overload fuels rapid growth of algae and aquatic plants, leading to dense blooms that block sunlight and consume dissolved oxygen as they decompose. While natural eutrophication occurs over geological timescales, human activities like agricultural runoff, sewage discharge, and industrial waste have dramatically accelerated this process, turning it into a widespread environmental crisis. The resulting oxygen depletion, known as hypoxia or anoxia, creates 'dead zones' uninhabitable for most aquatic organisms, devastating fisheries and disrupting entire ecosystems. Addressing cultural eutrophication involves managing nutrient inputs through improved wastewater treatment, sustainable farming practices, and watershed management, a global challenge highlighted by initiatives like the [[united-nations-development-programme|United Nations Development Programme]]'s [[sustainable-development-goals|Sustainable Development Goals]].