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| Climate change in California | |
|---|---|
| Name | California |
| Location | California |
| Climate | Mediterranean, alpine, desert |
Climate change in California presents a multifaceted challenge affecting the Sierra Nevada, Central Valley, Los Angeles County, San Francisco Bay Area, Imperial County and remote areas such as Death Valley National Park and Channel Islands National Park. Rising temperatures, altered precipitation, shrinking snowpack and sea level rise interact with existing stresses on infrastructure overseen by institutions like the California Department of Water Resources, California Air Resources Board, California Energy Commission and California Natural Resources Agency. Responses involve legislation such as AB 32, SB 32 and agencies including the California Public Utilities Commission and regional efforts by the Metropolitan Water District of Southern California, Los Angeles Department of Water and Power and San Francisco Public Utilities Commission.
California's climate trends reflect warming observed across the Sierra Nevada, Mojave Desert, Klamath Mountains and coastal zones including San Diego County and Monterey Bay. Historical records from the Los Angeles Times archives, data collected by National Oceanic and Atmospheric Administration, NASA satellite missions such as Landsat and field work at the University of California, Berkeley show increased annual mean temperatures, reduced snowpack in the Tahoe Basin, and shifts in seasonal precipitation patterns affecting the Sacramento River. Policy milestones include the passage of AB 32 establishing greenhouse gas targets and participation in the Western Climate Initiative cap-and-trade program coordinated with Province of British Columbia and Quebec. Major actors include regulators like the California Air Resources Board, research centers such as the Scripps Institution of Oceanography, Lawrence Berkeley National Laboratory, Stanford University, and advocacy groups like the Natural Resources Defense Council, Sierra Club and The Nature Conservancy.
Shifts in phenology and range affect species across Yosemite National Park, Sequoia National Park, Redwood National and State Parks and coastal refuges like Elkhorn Slough. Warming and drought stress have accelerated dieback in coast redwood groves studied by researchers at University of California, Santa Cruz and led to bark beetle outbreaks documented in the Sierra Nevada by teams from USDA Forest Service and California Polytechnic State University. Marine heatwaves in the Pacific Ocean and warm events such as the “Blob” have driven kelp forest declines near the Channel Islands and range shifts in Pacific sardine and California sea lion populations monitored by the Monterey Bay Aquarium Research Institute and NOAA Fisheries. Wetland loss around the San Francisco Bay, invasive species expansion in the Salton Sea, and altered fire regimes threaten habitat for species like the California condor, mountain yellow-legged frog, and Delta smelt; recovery efforts are coordinated by agencies including the U.S. Fish and Wildlife Service and nonprofits like Point Blue Conservation Science.
Decreased snowpack in the Sierra Nevada reduces runoff timing for the Sacramento–San Joaquin River Delta and reservoirs managed by the California Department of Water Resources and United States Bureau of Reclamation. Irrigation demands in the Central Valley and at corporate farms in Fresno County and Kern County have risen, impacting crops produced in Salinas Valley and commodities traded through the Port of Los Angeles. Groundwater overdraft in the San Joaquin Valley prompted enactment of the Sustainable Groundwater Management Act and coordination with districts such as the Tulare Lake Basin Water Storage District and Central Valley Project. Water allocation conflicts involve stakeholders including Pacific Gas and Electric Company, Oakland utilities, and tribal governments like the Yurok Tribe and Miwok people. Droughts linked to climate variability influenced operations at Shasta Lake and Folsom Lake and increased salinity intrusion in the South Bay Salt Pond Restoration Project area.
Longer fire seasons and fuel accumulation have contributed to megafire events in Butte County, California, Santa Barbara County, Santa Clara County, and Los Angeles County. Notable incidents have mobilized responses from the California Department of Forestry and Fire Protection (CAL FIRE), Federal Emergency Management Agency, and local fire districts. Wildfire smoke has degraded air quality across the San Joaquin Valley, Los Angeles Basin, San Francisco Bay Area and downwind regions monitored by the Bay Area Air Quality Management District and South Coast Air Quality Management District, exacerbating respiratory conditions treated in hospitals such as UCLA Medical Center and University of California, San Francisco Medical Center. Public health studies by institutions like the California Department of Public Health and Harvard T.H. Chan School of Public Health link increased heat waves in Bakersfield and Riverside to heat-related morbidity, particularly among residents of Skid Row, Los Angeles and agricultural workers represented by unions such as the United Farm Workers.
Economic sectors affected include agriculture in the Central Valley, tourism in Yosemite National Park and Lake Tahoe, fisheries off the Point Reyes National Seashore, and energy systems serving Silicon Valley, San Diego, and Los Angeles. Insurance markets, with carriers like State Farm and Allstate, have adjusted underwriting practices following events including the 2017 California wildfire season and 2018 Camp Fire. Housing and displacement pressures have prompted local measures in cities such as Santa Rosa and Paradise, with involvement from humanitarian organizations like the Red Cross and state programs administered through the Governor of California. Climate-related inequities affect frontline communities in East Oakland, Imperial Valley and tribal lands such as the Hoopa Valley Tribe.
California has pursued mitigation through renewable energy mandates under the California Renewable Portfolio Standard, vehicle emissions programs via the California Air Resources Board and adoption of zero-emission vehicle incentives tied to automakers regulated by the California Air Resources Board and federal agencies like the Environmental Protection Agency. Cap-and-trade programs implemented in collaboration with Quebec and elements of the Western Climate Initiative aim to reduce emissions from sectors overseen by the California Public Utilities Commission and utilities such as Pacific Gas and Electric Company and Southern California Edison. Building codes updated by the California Energy Commission and local ordinances in San Francisco and Los Angeles promote electrification and efficiency; research partnerships with Lawrence Livermore National Laboratory and National Renewable Energy Laboratory inform decarbonization pathways.
Adaptation involves regional plans by entities such as the Association of Bay Area Governments, Los Angeles County Metropolitan Transportation Authority, and tribal governments including the Yurok Tribe and Pomo people. Infrastructure projects include seawalls and managed retreat in San Francisco and Monterey, reservoir operations adjustments at Oroville Dam and groundwater recharge programs coordinated with the Central Valley Flood Protection Board. Conservation strategies by the California Department of Fish and Wildlife, habitat restoration led by The Nature Conservancy, and community resilience initiatives supported by the Federal Emergency Management Agency aim to reduce vulnerability in places like Ventura County, Santa Cruz County and the Salton Sea. Research centers at Stanford University, University of California, Davis and Scripps Institution of Oceanography continue to model scenarios used by policymakers including the Governor of California and state legislatures.