Sustainability Language

Water, Waste & Pollution

Dead zone

Low-oxygen (hypoxic) areas of oceans and lakes where eutrophication-driven algal decay has depleted oxygen, leaving most aquatic life unable to survive.

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Definition

A dead zone is a hypoxic — low-oxygen — area of an ocean or lake in which few organisms can survive. Dead zones form through eutrophication: excess nutrients (nitrogen and phosphorus) from agricultural runoff, sewage and atmospheric deposition fuel algal blooms; when the algae die, bacterial decomposition consumes dissolved oxygen, and waters that cannot be reoxygenated become uninhabitable for most aquatic life.

References

WRI

scale and impacts

Overview

What it means

The downstream, aquatic endpoint of nutrient pollution — visible in systems such as the Gulf of Mexico and historically the Baltic Sea.

How it is used

The term is used in water-quality science, fisheries management and nutrient-policy debates; WRI identifies eutrophication and hypoxia as among the leading causes of water-quality impairment over the past 50 years.

Why it matters

Dead zones are a planetary-scale symptom of the nitrogen and phosphorus boundary being exceeded, linking farm policy directly to marine ecosystem collapse.

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