By Christian Mey Boudoug
The Southeastern United States, with its extensive coastline along the Atlantic Ocean and Gulf of Mexico, is highly vulnerable to the impacts of climate change, especially rising sea levels. Home to rapidly growing cities like Miami and New Orleans, this region faces significant risks to communities, infrastructure, and ecosystems as climate-related threats intensify.
Fig: Coastal Vulnerability to Sea Level Rise in Southeastern US.
Source : https://climatechange.chicago.gov/climate-impacts/climate-impacts-southeast
Rising Temperatures and Extreme Weather
Since 1970, average temperatures in the Southeast have increased by about 2°F, and by the end of the century, they are expected to rise another 4°F to 8°F. This warming trend leads to more frequent extreme heat days and intensifies weather events like hurricanes. The 2020 Atlantic hurricane season was the most active on record, with 30 named storms. Such storms, now often stronger and more damaging, erode shorelines, overwhelm infrastructure, and put added pressure on coastal communities.
With over 80 million residents in the region, the stakes are high, and the impacts on public health, local economies, and natural habitats across the area are increasingly worrying. But the effects of climate changes in the region go beyond rising temperatures and extreme weather.
Sea Level Rise and Coastal Vulnerability
The Region’s 29,000 miles of coastline, including urban areas like Miami and New Orleans, is especially susceptible to sea level rise. Small increases in sea level can lead to significant flooding, accelerated by thermal expansion and land subsidence. According to the Intergovernmental Panel on Climate Change (IPCC), global sea levels could rise by 1 to 2 feet by 2100, bringing frequent flooding, shoreline erosion, and extensive infrastructure damage. South Florida is already experiencing “sunny day flooding,” where streets flood on clear days due to high tides. Rising seas also push saltwater into freshwater aquifers, threatening drinking water supplies. Additionally, aging flood control systems, such as canals and levees, are struggling to keep up with the rising waters, jeopardizing long-term resilience. The Environmental Protection Agency (EPA) has noted that as coastal aquifers become saline, communities may need to drill deeper wells, raising costs and straining resources.
Inland areas like Kentucky, Tennessee, and parts of Alabama are projected to see a 5% to 6.4% decline in water availability by 2060, posing challenges for agriculture, energy, and urban needs.
Human Health and Ecosystem Impacts
Increasing temperatures contribute to harmful ground-level ozone, worsening air quality across urban areas in the Southeast. This pollutant, a component of smog, can aggravate respiratory issues, particularly for vulnerable populations like children and the elderly. Higher temperatures also encourage the spread of harmful bacteria, such as Vibrio, which can cause infections from contaminated seafood.
Rising sea levels threaten ecosystems, as saltwater intrusion harms coastal wetlands and estuaries. This shift disrupts fish populations and other species that rely on these habitats. Agricultural productivity also suffers from heat stress and saltwater contamination, challenging the region’s economy.
Sources
- National Oceanic and Atmospheric Administration (NOAA)
- Intergovernmental Panel on Climate Change (IPCC)
- U.S. Environmental Protection Agency (EPA)
- United States Global Change Research Program (USGCRP)