Rising floods damage crops pollute water raise emissions and threaten health
Climate change is increasing flooding across agricultural regions in the United States, creating serious risks for food production, water safety, and public health. New scientific studies show that flooding damage to crops has been underestimated for many years.
Traditional crop models mainly focus on drought damage. However, researchers have now added flood impacts and discovered that flooding can cause losses equal to or greater than droughts in many farming areas. Corn, soybeans, and wheat are among the most affected crops.
States such as Illinois, Iowa, Indiana, Minnesota, Nebraska, Missouri, Kansas, and Mississippi face the highest risks. These states are major crop producers, meaning losses could influence national food supplies and prices. Under high greenhouse gas emissions, future annual crop losses are expected to rise steadily through the end of the century.
Millions of acres of farmland are located in areas known as 100‑year flood plains. These areas were once expected to flood rarely, but climate change is increasing flood frequency, making farming more difficult and unpredictable.
Flooding harms soil quality and spreads fertilizers and pesticides into rivers and drinking water systems. Corn farming is especially vulnerable because it uses large amounts of nitrogen fertilizer. When floods reduce oxygen in soil, natural microbes release nitrous oxide, a powerful greenhouse gas.
Agriculture is already the largest source of nitrous oxide emissions in the United States, with corn production contributing more than half of these emissions. Increased flooding may worsen climate change by raising emissions further.
Flood impacts extend beyond farms. Contaminated water can affect nearby communities, while food shortages may raise prices. Scientists warn that without strong climate action and improved farming planning, flooding will continue to threaten agriculture, the environment, and human health.
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