SACRAMENTO, California—Hints of a changing climate can be found all over central California.
In the western Sierra Nevadas, the air is filled with smoke and haze from wildfires. In the
Central Valleysouth of Sacramento, dust whips across fallow fields, thanks to lack of rain and a
record drought. Near the coast, people worry about bigger storms.
"Scientific predictions say that with global warming, we'll see more variability in California's climate, with more intense storms, longer dry periods, and less snowpack," hydrogeologist and geology department chair
Tim Horner said from his office at California State University, Sacramento.
All this means climate change is going to force the state to "make some really tough decisions" over the coming years, Horner said.
Golden State officials will have to figure out how to protect the state's long coastline, keep a vast agricultural industry going, apportion dwindling water resources, drive smart development, and keep 38 million residents safe, all while dealing with a financial crisis.
Here are some of the key issues California will soon have to grapple with due to climate change:
1. Drought and Wildfires
Some 75 percent to 80 percent of California's freshwater comes from the
Sierra Nevada snowpack, a resource that has dwindled in recent years and is threatened by future climate change, Frank Gehrke, who serves as the chief of snow surveys for California's
Department of Water Resources, explained from a granite dome in Yosemite. In February, the Sierra snowpack was only 14 percent of normal.
"Regardless of what happens with climate change, even in a good year we don't have enough water," Gehrke said as he viewed the tiny pockets of ice left at the top of the national park.
Climate scientists predict the region will get even hotter and drier. And as more of the state's precipitation falls as rain instead of snow in the mountains, it will run off the land more quickly, ending up in the ocean. In the short term, farmers and cities will increasingly turn to reservoirs and groundwater, Gehrke said, but how long will that last? As it stands, California has only about a year and a half's supply saved behind dams, and groundwater tables have been dropping precipitously.
Lack of water has also led to
more and larger wildfires, including last year's
Rim fire, which scorched the largest area on record in the Sierra Nevadas. . . .
5. Loss of Native Fish
California once supported vibrant commercial and recreational fisheries, but the fish have long been in decline. According to Horner, native species like salmon, steelhead, and trout are now outnumbered by nonnative species like carp.
"A lot of the native fish in California are coldwater fish, so as the waters get warmer, they're not going to do as well," said Horner, who leads stream restoration projects around the state.
In fact, researchers at the University of California, Davis, found in 2013 that, of the state's 121 native fish species,
82 percent are likely to be driven to extinction, or close to it, by climate change.
To try to cool the rivers and keep the native fish alive, the state has been releasing water from dams. But that's unpopular with farmers, and works only as long as there is water to release.
Brian Clark Howard
National Geographic
AUGUST 12, 2014