A 聽released by the National Park Service (NPS) on Tuesday聽found that parks along the seashore of the continental United States聽are in danger from rising sea levels. Researchers for the NPS and Western Carolina University (WCU) determined that聽a one-meter increase in ocean height would put聽39 percent (16 of the 40 parks evaluated) at a high exposure risk. The economic impact of the assets at risk is valued at $40 billion, referring to the amount it would cost to plan, design, and rebuild them.
To evaluate levels of risk, WCU researchers visited the parks, spoke with superintendents and other park officials, and took GPS coordinates to map the threatened areas. Any spots lower than one meter were found to be a聽high聽exposure risk. Features that would be at greater risk of damage from storms or changes in the landscape from a one-meter sea level rise also fell into the high-risk category.
Sixteen of the 40 parks fell into the low-exposure group, with less than 25 percent of their assets classified as high聽exposure risks. Eight parks fell in the intermediate聽exposure group. The Southeast had the most parks in the high聽exposure group, including the Everglades and Big Cypress National Preserve.
The one-meter rise is expected to happen within the next 100 to 150 years, according to the study, and the authors acknowledge that roads, buildings, and parking lots in some of the parks鈥攑articularly those on low-lying barrier islands鈥攁re already at risk, even without counting the dangers currently posed by聽coastal storms and erosion. The researchers also said they were conservative in ranking the level of exposure. 鈥淚n other words,鈥 the authors wrote, 鈥渢he assets identified in this study as being vulnerable are most certainly vulnerable, and the total is likely to be an underestimate.鈥
An assessment of another 30 parks is already underway.