New research suggests the risk may be growing faster than expected.
A new scientific study has raised serious concerns about the future of some of America’s largest coastal cities.
Researchers are warning that parts of Los Angeles and San Francisco are slowly sinking — a process that could increase the risk of flooding and long-term damage.
The findings come from a study led by NASA and published in the journal Science Advances.
Scientists analyzed high-resolution satellite data collected between 2015 and 2023 to better understand how land levels are changing along the California coast.
What they discovered was concerning.
In several areas, the land is sinking — a process known as subsidence — while sea levels continue to rise at the same time.
This combination creates a dangerous situation.
Subsidence can be caused by a variety of factors, but one of the main drivers identified in the study is groundwater extraction.
When large amounts of groundwater are removed from underground reservoirs, the land above can gradually sink.
This process is already affecting densely populated regions.
And because nearly 70% of Californians live near the coast, the potential impact is significant.
Scientists say the situation may be more serious than previously believed.
Their findings suggest that sea levels in parts of these cities could rise more than twice as much as earlier estimates by 2050.
That means areas already at risk of flooding could face even greater threats in the coming decades.
Experts warn that this is not just a distant problem.
It is happening now.
“In effect, we’re seeing that the footprint of land experiencing significant impacts has expanded,” said landslide expert Alexander Handwerger.
“The speed is more than enough to put human life and infrastructure at risk.”
The implications are far-reaching.
As sea levels rise and land sinks, coastal flooding becomes more frequent and more severe.
Infrastructure such as roads, buildings, and drainage systems may struggle to cope with the changes.
Homes and businesses located near the coast could face increasing damage over time.
Scientists also point out that while some natural factors contribute to land movement, human activity is playing a major role.
Groundwater extraction, urban development, and climate change are all accelerating the problem.
Unlike natural processes, these factors can be managed — but only with the right policies and awareness.
Researchers are now calling for urgent action.
They emphasize the need to update how cities measure and prepare for sea level rise, as well as to improve coastal planning and infrastructure.
Without these changes, the risks could continue to grow.
For millions of people living in coastal cities, the warning is clear.
The ground beneath them may not be as stable as it once seemed.
Climate change and urban environmental risks are driving increased demand for flood insurance policies, property protection services, climate risk assessment tools, smart infrastructure solutions, and sustainable urban planning services. Governments and homeowners alike are investing in long-term solutions to protect properties, reduce environmental impact, and adapt to rising sea levels and changing climate conditions.
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