O‘ahu’s iconic sandy beaches could face severe erosion by the end of the century, according to a new study from the Coastal Research Collaborative (CRC) at the University of Hawai‘i at Mānoa. The research, published in Scientific Reports, warns that 81% of O‘ahu’s coastline is at risk of erosion by 2100, with 40% of shoreline loss projected to occur as early as 2030. The findings serve as a critical call to action for policymakers, environmental agencies, and coastal communities to implement sustainable coastal management practices to safeguard O‘ahu’s beaches—vital both for tourism and environmental resilience. “By including additional satellite data and seasonal modeling, our forecasts show that erosion will increase by nearly 44% above our previous estimates in the short-term, meaning that we anticipate more severe erosion sooner,” said Moskvichev. Coastal erosion can limit beach access, damage fragile ecosystems and infrastructure, and destroy homes.