San Francisco Chronicle: About 20 percent of California's oil and natural-gas production uses hydraulic fracturing - with almost all of it happening in one corner of the San Joaquin Valley - according to the most authoritative survey yet released of fracking in the Golden State.
Oil companies frack 125 to 175 of the roughly 300 wells drilled in California each month, according to the survey released Wednesday by the California Council on Science and Technology. Nearly 93 percent of all fracked wells lie in western Kern...