Craig Miller/KQED

Working Out Kinks in the Cap-and-Trade Market

California's cap-and-trade program to cut greenhouse gases resumes with its second auction of carbon allowances to industrial polluters. In addition to the state's carbon footprint, billions of dollars are at stake. But some questions remain from the first auction. Reporter: Craig Miller

Lauren Kennedy/KQED

Touring Alfred Hitchcock's San Francisco

Ahead of the Oscars, we couldn't help but pick out a particular profile from our occasional series on volunteers in California, called "The Giving State." In this segment we meet a nonprofit consultant from San Leandro who leads free walking tours in San Francisco.

• More: The Giving State series