Scientists from the Woods Hole Oceanographic Institution and other researchers warn that human-driven sea-level rise is increasing coastal flooding risks [1].

This shift is critical because it alters the baseline for water height. As the baseline rises, storm surges and extreme flood events that were previously rare now occur with greater frequency, threatening infrastructure and populations in coastal regions [3].

According to the research, extreme flood events that were once expected to occur only once in a century are now happening far more frequently [1]. The study suggests that sea-level rise is accelerating, a finding that contradicts a previous federal report [2].

Researchers highlighted specific global vulnerabilities, including Long Wharf in Boston, U.S., and Wellington, New Zealand [1, 2]. The data indicates that real-world ocean levels are exceeding previous flood-risk forecasts based on crude global modeling [4].

These findings were reported in December 2025, emphasizing a picture of how quickly the coastline is changing [2, 4]. The acceleration of these levels means that coastal cities may face chronic flooding much sooner than earlier projections suggested.

“Extreme flood events that were once expected only once in a century are now occurring far more frequently”

The discrepancy between federal reports and these new findings suggests that current coastal defense strategies may be based on outdated or overly optimistic data. If the baseline sea level continues to accelerate, urban planning for coastal cities will require immediate revision to prevent catastrophic infrastructure failure during routine storm events.