Global Sea Level Could Rise 50 Feet by 2300, Study Says

Sea-level rise varies over location and time, and scientists have developed a range of methods to reconstruct past changes and project future ones. But despite the differing approaches, a clear story is emerging regarding the coming decades: From 2000 to 2050, global average sea-level will most likely rise about 6 to 10 inches, but is extremely unlikely to rise by more than 18 inches. Beyond 2050, projections are more sensitive to changes in greenhouse gas emissions and to the approaches for projecting sea-level change.

“There’s much that’s known about past and future sea-level change, and much that is uncertain. But uncertainty isn’t a reason to ignore the challenge,” said study co-author Robert E. Kopp, a professor in the Department of Earth and Planetary Sciences at Rutgers University–New Brunswick and director of Rutgers’ Institute of Earth, Ocean, and Atmospheric Sciences. “Carefully characterizing what’s known and what’s uncertain is crucial to managing the risks sea-level rise poses to coasts around the world.”

Scientists used case studies from Atlantic City, New Jersey, and from Singapore to discuss how current methods for reconstructing past sea-level change can constrain future global and local projections. They also discussed approaches for using scientific sea-level projections and how accurate projections can lead to new sea-level research questions.

A large portion of sea-level rise in the 20th century, including most of the global rise since 1975, is tied to human-caused global warming, the study says.

Kopp led the review with Benjamin P. Horton, a former Rutgers professor now at Nanyang Technological University in Singapore. Co-authors include Andra J. Garner, an assistant research professor in Rutgers’ Department of Earth and Planetary Sciences, and other scientists at Boston College and Nanyang Technological University.

Todd Bates