Economic and Environmental Cost of Wetland Loss Reached Billions of Dollars

Wetlands are among the most critical elements of the world's ecosystem due to their rich biodiversity and carbon storage capacities. During heavy rainfall, these areas function like natural sponges on the landscape, absorbing stormwaters and slowing down the flow rate. This natural mechanism significantly reduces the risk of flooding in lower basins while also protecting underground and above-ground infrastructure. However, extreme flood events occurring with the increasing effects of climate change make the protective role of wetlands even more essential day by day. Unfortunately, these natural shields are increasingly under threat due to rapidly continuing development and agricultural activities.

It is noted that since the 1700s, at least 40 percent of wetland loss has occurred in the United States. This loss has caused a significant portion of these ecological benefits to disappear. The disappearance of wetlands not only affects local plant and animal species but also creates severe economic penalties for human settlements. Especially in coastal areas and settlements near rivers, the cost of this ecological destruction is increasing day by day. Scientists continue to conduct extensive research to fully understand the economic consequences of this environmental decline.

A new study published in the journal Nature Water puts a clear price tag on flood risk reduction, one of the essential services provided by wetlands. According to the study, wetland losses in the United States between 1985 and 2023 increased flood insurance compensation payments for homes by more than 10 billion dollars. This figure constitutes about nine percent of all river-related flood damage payments. According to researchers, the regions where this situation causes the highest costs are Houston, the southeast of Louisiana, and the coastal stretches of Florida. These data strikingly demonstrate how the destruction of natural ecosystems can be linked to tangible out-of-pocket money.

However, Jesse Gourevitch, one of the authors of the study and an economist at the Environmental Defense Fund, emphasizes that this announced cost is actually a very serious underestimated, that is, an underestimation. This is because under the National Flood Insurance Program (NFIP), which is the main data source of the study, only about 30 percent of the flood damage that occurs is covered by insurance. This means that a massive volume of uninsured damage is not fully reflected in official statistics. Therefore, the true economic reflection of wetland loss is considered to be of massive proportions, far beyond the figures presented. The true total cost is highly likely to reach billions of dollars, well above the insured payments.

The team conducting the research used NFIP's payment data regarding river floods to directly link individual properties to specific flood damages. Scientists then combined this data with wetland maps of sub-basins located in the upper parts of watersheds, meticulously tracking how a specific area has changed from 1985 to the present. They also took into account various environmental and structural factors that could affect the severity of floods, such as heavy rainfall events and the increase in impermeable surfaces like roads or roofs. Thanks to this comprehensive methodology, the researchers were able to map the financial impacts of natural habitat loss on individuals and the state with high accuracy. The use of detailed time series, such as NASA satellite imagery showing the Gulf Coast, has also added great scientific depth to the field studies.