Scientists are sounding the alarm after global sea levels rose at an unexpectedly high rate in 2024, according to new data from NASA. The agency’s analysis found that sea levels increased by nearly a quarter of an inch last year—significantly outpacing the projected 0.17 inches per year.

The Science Behind The Surge

The primary driver? Unusual ocean warming and accelerated ice melt. More than 90% of the excess heat from greenhouse gas emissions is absorbed by the oceans, causing water to expand in a process known as thermal expansion. This accounts for about two-thirds of observed sea level rise, while the remaining third comes from melting glaciers and ice sheets.

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Antarctica is losing roughly 150 billion tons of ice annually, while Greenland sheds around 270 billion tons per year—equivalent to the weight of 26,000 Eiffel Towers. Together, they are adding billions of gallons of water to the oceans, pushing sea levels higher at an accelerating pace.

The Growing Threat

Rising sea levels pose a significant threat to coastal cities, infrastructure, and ecosystems. Higher water levels mean more destructive storm surges, faster coastal erosion, and increased high-tide flooding. If all the world’s ice sheets and glaciers melted, global sea levels would surge by over 195 feet—enough to submerge entire cities.

The Warmest Year On Record

Adding to the concern, 2024 was also confirmed as the hottest year ever recorded, with global temperatures soaring 2.3 degrees Fahrenheit above NASA’s 20th-century average. “With 2024 as the warmest year on record, Earth’s expanding oceans are following suit, reaching their highest levels in three decades,” said Nadya Vinogradova Shiffer, head of physical oceanography programs at NASA.

The consequences are already taking shape. A Climate Central analysis projects that by 2050, more than four million acres of U.S. land could be partially submerged by rising tides. Without decisive action to curb emissions, the pace of sea level rise may accelerate even further, reshaping coastlines and economies worldwide.
Read 2024: The Hottest Year In Human History – A Turning Point For The Planet