The California Environmental Protection Agency is welcoming the latest Climate Assessment, saying it underscores the importance of taking action.
The agency says the impacts of climate change are already evident in the Golden State.
Drought, sea level rise and the reduction in runoff in the spring from the mountains, which Spokesman Alex Barnum says have an important impact on agriculture and the state's economy.
"If we're looking at more extreme droughts, more extreme weather, that can greatly affect the market value of fruits and vegetables," Barnum said.
But Barnum says California is taking action to address the impact, including policies aimed at increasing renewable power and reducing auto emissions.