In the past century, global mean sea level has increased by 7 to 8 inches with human influence the dominant cause of observed atmospheric and oceanic warming. Given current trends in greenhouse gas emissions and increasing global temperatures, sea level rise is expected to accelerate in the coming decades, according to the most recent available science, by the year 2100, sea levels may rise by 1 to 6.6 feet (0.3 to 2.0 meters) (OPC 2024). While over the next few decades, the most damaging events are likely to be dominated by large El Niño - driven storm events in combination with high tides and large waves, impacts will generally become more frequent and more severe in the latter half of this century.

The impacts of sea level rise in California will affect almost every facet of our natural and built environments. Natural flooding, erosion, and storm event patterns are likely to be exacerbated by sea level rise, leading to significant social, environmental, and economic impacts. Through its Sea Level Rise Policy Guidance and ancillary efforts, the Coastal Commission advances, supports, and helps to fund California's preparation for these critical challenges to ensure a resilient coast for present and future generations.