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| California Fourth Climate Change Assessment | |
|---|---|
| Name | California Fourth Climate Change Assessment |
| Jurisdiction | California |
| Agency | California Natural Resources Agency |
| Established | 2017 |
| Published | 2018–2020 |
| Website | California Fourth Climate Change Assessment |
California Fourth Climate Change Assessment
The California Fourth Climate Change Assessment is a comprehensive statewide synthesis produced under the auspices of the California Natural Resources Agency and coordinated with the California Environmental Protection Agency, the California Energy Commission, and the California Air Resources Board. It builds on the legacy of the California Climate Change Assessments series and interfaces with federal initiatives such as the United States Global Change Research Program and international efforts like the Intergovernmental Panel on Climate Change. The assessment integrates climate science, sectoral analyses, and policy-relevant guidance to inform resilience planning across California, including municipal, regional, and tribal jurisdictions.
The assessment comprises technical reports, regionally focused studies, and sectoral syntheses drafted by academic institutions including the University of California, Berkeley, the University of California, Davis, the Scripps Institution of Oceanography, and the Stanford Woods Institute for the Environment. It synthesizes projections consistent with scenarios used by the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, and the Princeton University climate modeling community. Partnering organizations include the Lawrence Berkeley National Laboratory, the Pacific Institute, and the California State University system. The initiative was funded through appropriations by the California Legislature and coordinated with state agencies such as the California Department of Water Resources and the California Department of Fish and Wildlife.
Key findings draw on model ensembles from the Coupled Model Intercomparison Project and downscaling methods refined by researchers at Columbia University and the University of Washington. The assessment reports accelerated warming trends consistent with pathways in the Representative Concentration Pathways and Shared Socioeconomic Pathways literature, projecting increased frequency of extreme heat events paralleling analyses from the National Climate Assessment and the European Centre for Medium-Range Weather Forecasts. Observed changes include cryospheric decline echoing studies from the US Geological Survey and shifted hydrologic regimes noted by the California Water Resources Board. Sea level rise estimates align with guidance from the National Research Council and the California Ocean Protection Council, and atmospheric chemistry interactions mirror findings from the Environmental Protection Agency and the California Air Resources Board on air quality degradation.
The assessment details impacts on agriculture observed in the Central Valley, informed by research from the United States Department of Agriculture and the California Department of Food and Agriculture, and wildfire regime changes in the Sierra Nevada and Southern California drawing on analyses by the United States Forest Service and the California Department of Forestry and Fire Protection. Coastal communities from San Diego to the San Francisco Bay Area face combined risks cited by the California Coastal Commission and the Metropolitan Transportation Commission. Impacts on public health reference studies from the California Department of Public Health and the Centers for Disease Control and Prevention, while biodiversity consequences cite the Nature Conservancy and the Smithsonian Institution collections. Economic assessments reference modeling approaches used by the RAND Corporation and the World Bank to estimate damages to infrastructure overseen by agencies like the California Transportation Commission.
Recommended strategies draw from successful programs at the City of Los Angeles, the City and County of San Francisco, and the State Water Resources Control Board including urban greening, managed retreat, and demand-side management in energy facilitated by the California Independent System Operator. Nature-based solutions reference projects promoted by the National Audubon Society and the California Coastal Conservancy. Mitigation recommendations align with California Global Warming Solutions Act of 2006 frameworks administered by the California Air Resources Board and leverage innovations from the Advanced Research Projects Agency-Energy and private-sector partners like Tesla, Inc. and NextEra Energy.
The assessment used peer-reviewed methodologies endorsed by the National Academy of Sciences and employed downscaling techniques from the Multivariate Adaptive Constructed Analogs literature and statistical approaches developed at Lawrence Berkeley National Laboratory. Scenario development incorporated demographic inputs from the California Department of Finance and economic baselines from the Bureau of Economic Analysis. Quality assurance included expert review panels with participants from Princeton University, the University of California, Los Angeles, the Massachusetts Institute of Technology, and international contributors associated with the World Meteorological Organization.
Stakeholder engagement convened tribal governments including the Yurok Tribe and the Hoopa Valley Tribe, local governments across Los Angeles County, Orange County, and Alameda County, and non-governmental organizations such as the Sierra Club and the Natural Resources Defense Council. The assessment informed regulatory actions by the California Public Utilities Commission and planning guidance used by the Governor of California and the California Strategic Growth Council. International delegations from the European Union and municipal delegations from Vancouver and Mexico City have cited the assessment in adaptation exchanges and capacity-building partnerships.
Implementation relies on funding streams from state bonds like Proposition 1 and agencies including the California Infrastructure and Economic Development Bank, with monitoring frameworks coordinated through data platforms at the California Environmental Data Exchange Network and long-term observation networks such as the California Cooperative Oceanic Fisheries Investigations. Ongoing evaluation engages academic partners from the University of California system and federal collaborators including the National Science Foundation to track progress, refine projections, and guide iterative policy updates tied to legislative vehicles in the California Legislature.