The Diesel Battle

California is on track toward implementing the nation's toughest and most sweeping regulations aimed at global warming. In Sacramento Thursday, the California Air Resources Board adopted plans to cut greenhouse gas emissions by 15 percent over the next 12 years. The board followed up with new regulations on diesel trucks. The new regulations carry a price tag of $5 billion or so, but given the health complications from diesel emissions, regulators feel they can't afford not to act. Reporter: David Gorn

Tunes to Travel By

Traveling by air these days is something to survive more than savor. Long security lines and lousy airplane food alone may be enough to make you stay home. But this holiday season, San Francisco International Airport is doing something that will be music to the ears of travelers -- quite literally. Reporter: Julie Caine

• More: Photo Slideshow

Holiday Books

All the recent grim economic news has a lot of people scaling back on this year's holiday shopping. But one item that's almost always within reach, price wise, is a good book. We talk with our book critic Oscar Villalon about some of his favorite reads of the season.

• More: Share what's on your holiday book wish list

The Emerald Cup

We Californians are justifiably proud of the things we grow here. The Central Valley has its prize-winning almonds and peaches. Napa Valley is known for its wine grapes, and Watsonville has some of the sweetest strawberries in the world. In the far reaches of Northern California, locals get together this time of year to celebrate another signature crop -- marijuana. Reporter: Christina Aanestad