The study, published in the journal Nature Climate Change, found that even under a low-emissions scenario, sea levels could rise by as much as 2 feet by the end of the century, and up to 6 feet under a high-emissions scenario.

This would have devastating consequences for California's coastal communities, which are home to over 25 million people. Many coastal cities and towns would be inundated, and millions of people would be displaced.

The study also found that the impacts of sea-level rise would be felt disproportionately by low-income communities and communities of color. These communities are often located in low-lying areas that are more vulnerable to flooding.

The study's authors say that immediate action is needed to reduce greenhouse gas emissions and mitigate the impacts of sea-level rise. This includes investing in coastal adaptation and resilience measures, such as building sea walls and levees, and restoring coastal wetlands.

Here are some specific examples of how sea-level rise could impact California's coastline:

* In San Francisco, sea-level rise could cause the city's iconic Embarcadero to be submerged, along with much of the city's waterfront.

* In Los Angeles, sea-level rise could inundate the Venice Beach neighborhood and damage the city's ports.

* In San Diego, sea-level rise could flood the city's Mission Bay and damage the Navy's base.

The impacts of sea-level rise are already being felt in California. In recent years, the state has experienced a number of major storms that have caused coastal flooding and erosion. These storms have caused billions of dollars in damage and have displaced thousands of people.

Sea-level rise is a serious threat to California's coastline, and it is only going to get worse if we do not take action to reduce greenhouse gas emissions.