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Assessment Research

California’s Fifth Climate Change Assessment is a portfolio of reports, research, and resources that contribute to the scientific foundation for understanding climate-related vulnerability throughout the state to help communities understand and develop informed responses to the impacts of climate change. The Fifth Assessment’s research and tools are designed to fill knowledge gaps about California’s climate future, inspire strategic climate actions, and shape planning, investments, and policies at the state, regional, and local scales. These products are accessible below by category, or see the full list.

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Reports

  • Los Angeles

    The Los Angeles Regional Report includes climate science, impacts, and adaptation information for southwest Los Angeles, Orange, west San Bernardino, west Riverside, and south Ventura counties.  The Los Angeles region encompasses the greater Los Angeles area, including most of LA County, Orange County, western San Bernardino and Riverside counties, and…

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  • North Coast

    The North Coast Regional Report includes climate science, impacts, and adaptation information for Del Norte, Humboldt, Lake, Mendocino, Siskiyou, and Trinity counties.   At the confluence of four major ecoregions and the Pacific Ocean, the North Coast region holds an extraordinary diversity of life, ecosystems, and cultural legacies. Its steep mountains,…

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  • Sacramento Valley

    The Sacramento Valley Regional Report includes climate science, impacts, and adaptation information for Butte, Colusa, Glenn, west Placer, Sacramento, Shasta, east Solano, Sutter, Tehama, Yolo, and Yuba counties.  The Sacramento Valley region stretches across most of the Sacramento River Watershed, extending from the Sacramento River Valley floor to the foothills…

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  • San Diego

    The San Diego Regional Report includes climate science, impacts, and adaptation information for San Diego County.  San Diego, California’s southernmost coastal county, has a Mediterranean climate with warm, sunny summers and mild, sometimes rainy winters, and some of the most variable annual precipitation in the United States. Dramatic contrasts unfold…

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  • San Francisco Bay Area

    The San Francisco Bay Area Regional Report includes climate science, impacts, and adaptation information for Alameda, Contra Costa, Marin, San Francisco, Napa, San Mateo, Santa Clara, West Solano, and Sonoma counties.  The San Francisco Bay Area encompasses nine counties at the confluence of the Pacific Ocean and the Central Valley.…

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  • San Joaquin Valley

    The San Joaquin Valley Regional Report includes climate science, impacts, and adaptation information for west Fresno, west Kern, Kings, west Madera, Merced, San Joaquin, Stanislaus, and west Tulare counties.  The San Joaquin Valley (SJV) is California’s most productive agricultural region. It is one of the state’s most dramatically transformed landscapes,…

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  • Sierra Nevada

    The Sierra Nevada Regional Report includes climate science, impacts, and adaptation information for Alpine, Amador, Calaveras, El Dorado, east Fresno, central Kern, Lassen, east Madera, Mariposa, Modoc, west Mono, Nevada, west Placer, Plumas, Sierra, east Tulare, and Tuolumne counties.  The Sierra Nevada region encompasses the Sierra Nevada mountain range in…

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  • Tribal and Indigenous Communities

    The Fifth Assessment’s Tribal and Indigenous Communities Statewide Topical Report brings together tribally led research, existing literature, and tribal expertise to examine how climate change is affecting California Native American tribes and communities across the state.  The report highlights the dynamics between climate change, historical and ongoing colonial impacts, ecocultural…

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  • Racial Equity and Climate Justice

    The Fifth Assessment’s Racial Equity and Climate Justice Statewide Topical Report was co-developed by frontline leaders and community representatives working alongside academic researchers. By centering community voices and lived experience, the report reflects rigorous analysis about realities of people who endure climate-related harms, and climate adaptation and resilience strategies grounded…

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  • Climate-Induced Human Displacement and Migration

    The Fifth Assessment’s Climate-Induced Human Displacement and Migration Statewide Topical Report discusses the complex and consequential challenges of climate mobility.   This report synthesizes current evidence on the drivers, pathways, and consequences of climate-induced displacement and migration in California, spanning intra-California mobility, interstate migration, and international migration to and from California.…

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