A state-commissioned report warns that Southern California could lose 30 to 70% of its beaches over the next several decades due to rising ocean levels and coastal erosion. The California Fifth Climate Change Assessment, released every few years, projects that nearly half of all beach cliffs may retreat by 30 to 80 feet by 2100, with a 1.6-foot sea level rise by 2060 increasing flood risks for low-lying areas including Santa Monica, Venice, Redondo Beach, and major ports. An estimated 15,000 people in Los Angeles County could be exposed to flooding and storm surges as a result.
The assessment also highlights broader climate impacts across the state, including a projected 4°F increase in average temperatures and 50% longer heat waves by mid-century. Inland regions, already prone to extreme heat, are expected to see even more severe conditions. For example, San Bernardino could experience 120 days per year above 95°F, up from 81 historically, while the hottest day of the year in Los Angeles and Orange counties may exceed 115°F by mid-century.
The report, led by the Governor’s Office of Land Use and Climate Innovation, emphasizes the urgency of climate mitigation efforts. Abby Edwards, senior deputy director of the office, described the findings as “hard to digest” but stressed the need to “double down on all of our climate mitigation goals.” The assessment updates prior projections with new data on rising temperatures, sea levels, and extreme weather patterns, underscoring the accelerating pace of climate change in California.
Key projections by region:
- Coastal erosion: 30-70% of Southern California beaches at risk, with cliffs retreating 30-80 feet by 2100.
- Sea level rise: 1.6-foot increase by 2060, increasing flood exposure for 15,000 people in Los Angeles County.
- Temperature increases: 4°F statewide average rise, with inland areas like San Bernardino facing 120 days above 95°F annually.
- Heat waves: 50% longer duration by mid-century, with inland regions experiencing the most extreme shifts.
The report serves as a comprehensive update to prior assessments, incorporating the latest climate models and observational data. It outlines risks to public health, infrastructure, and ecosystems, while also providing a roadmap for adaptation and resilience strategies. State officials have framed the findings as a call to action, urging policymakers to prioritize climate mitigation and preparedness measures to address the projected impacts.
The assessment does not project significant changes in overall precipitation patterns but warns that climate change will intensify existing extremes, such as droughts and heat waves. The findings are intended to inform state and local planning efforts, including infrastructure investments, land-use policies, and emergency response strategies.