Reviving the Dead Zone

The report analyzes the link between synthetic nitrogen fertilizer use in the Midwest and the formation of a hypoxic 'dead zone' in the Gulf of Mexico. It estimates that agricultural nitrogen losses have caused between $552 million and $2.4 billion in annual damages to Gulf fisheries and marine habitat ecosystem services since 1980. The authors argue that shifting to sustainable agricultural practices—such as cover cropping and conservation tillage—can reduce these losses, providing a significant return on investment by restoring marine productivity and improving soil resilience for farmers.

• Between 60 and 80 percent of the nitrogen loading that fuels the Gulf of Mexico dead zone originates from farming and livestock operations in the Midwest, with over 40 percent coming specifically from synthetic fertilizers used for crops like corn.
• The report estimates that agricultural nitrogen losses from the Midwest have caused annual damages to Gulf fisheries and marine habitat ecosystem services ranging from $552 million to $2.4 billion (in 2018 dollars) between 1980 and 2017.
• Since 1990, corn and soybean farmers in the Mississippi and Atchafalaya River basins applied approximately 114 million tons of fertilizer nitrogen, costing $37 billion (2018 dollars), with nearly 31 million tons of that nitrogen flowing into rivers and feeding the dead zone.
• The Gulf fishing industry is a major economic driver, with commercial fishing generating between $17 billion and $57 billion in economic impacts and 200,000 jobs in 2016, while recreational fishing and coastal tourism added another $57 billion and nearly 500,000 jobs.
• Hypoxia negatively impacts marine life by reducing the abundance of bottom-dwelling species like crustaceans and mollusks, and can cause populations of Atlantic croaker to decline by up to 25 percent if not significantly reduced.
• The shrimp industry is particularly vulnerable to the dead zone; in Texas, two-thirds of shrimper licenses have been repurchased by the state since the mid-1990s, and the number of boats going offshore has dropped by one-fourth since 2010.
• Climate change exacerbates the problem by increasing the frequency of heavy rains and floods in the Midwest, which washes more nitrogen into the Gulf, while rising ocean temperatures further worsen pollution effects.
• Adopting soil-health practices—such as cover cropping, conservation tillage, riparian buffers, and perennial plantings—could avert between $34.4 million and $990 million in annual damage costs to Gulf fisheries.
• Nitrogen runoff also harms human health upstream, causing acute conditions like 'blue baby syndrome' and chronic issues such as cancer and thyroid disease through contaminated drinking water.

APA

Anair, D., & Mahmassani, A. (2020). Reviving the Dead Zone. Union of Concerned Scientists. https://www.ucs.org/sites/default/files/2020-06/reviving-the-dead-zone.pdf

Chicago

Anair, Don, and Amine Mahmassani. Reviving the Dead Zone. Union of Concerned Scientists, 2020. https://www.ucs.org/sites/default/files/2020-06/reviving-the-dead-zone.pdf.

Wikipedia

{{cite report |last1=Anair |first1=Don |last2=Mahmassani |first2=Amine |title=Reviving the Dead Zone |publisher=Union of Concerned Scientists |date=June 2020 |url=https://www.ucs.org/sites/default/files/2020-06/reviving-the-dead-zone.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{anair2020reviving, author = {Anair, Don and Mahmassani, Amine}, title = {{Reviving the Dead Zone}}, institution = {Union of Concerned Scientists}, year = {2020}, month = jun, url = {https://www.ucs.org/sites/default/files/2020-06/reviving-the-dead-zone.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }