Extreme Weather
Researchers say warming trends are responsible for as much as 20 percent of the drought.
The loss to California's agricultural industry alone is estimated at $1.84 billion.
Danny is expected to become a hurricane by Thursday.
Some of the trees are nearly 3,000 years old.
WHAT'S HAPPENING
At least 22 people are dead or missing.
Brown said recent wildfires should be a "wake-up call" for the entire state.
Many of the buildings used to lie 60 feet below the surface.
Fifteen people are also injured, authorities say.
Gov. Jerry Brown declared a state of emergency and activated the California National Guard.
