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A group of high school students in San Francisco are using high-tech GPS cell phones to track their daily carbon footprint - and to gauge their daily environmental risk. The GPS tracks the students' trips and shows them how much carbon they use and are exposed to each week. As cell phones become more powerful, organizers hope to spread this movement virally.

Even in small amounts, lead can be poisonous. The California Attorney General's office is suing several manufacturers of artificial turf after lead was found in the pigment used to color it. Lead is especially harmful to children and that could be bad news around the state for anyone who has installed turf in playgrounds, soccer fields, child care centers and homes.

The predictions for climate change all warn that San Francisco Bay waters will rise. The latest estimate is the bay will be about 5 feet higher by the end of this century, and 16 inches higher by 2050. If the water rises high enough, a lot of expensive Bay-front property could be inundated. What can we do about it? And how do we plan for that? That's the subject of an innovative design contest that launches this week.

A single-family home with a yard and two-car garage may be the American dream for many Californians. But with real estate at a premium and traffic congestion getting worse, there is a new urban way of living that is becoming increasingly popular. Quest reports on the rise of the transit village and just why the trend has taken so long.

This year marks the 200th birthday of Charles Darwin - and the 150th anniversary of his landmark work, "On the Origin of Species". One of the iconic fossils that supports Darwin's theory of evolution is called the Archaeopteryx and it was recently flown out to Stanford University for an unusual test. Scientists are bombarding this dino-bird with high-tech gadgetry to unlock even more information about how we came to be here.

As the economy struggles, a lot of people are thinking about prices these days. That's the focus of a new project at Stanford University, too, but their aim is to put a value on something that's never had a price tag - nature.

Following the recent crash landing of a U.S. Airways jet into the Hudson River, QUEST takes a look at local efforts to avoid collisions between planes and birds. Every year pilots in the U.S. report more than 7,000 bird strikes. The Sacramento International Airport has one of the highest incidences of bird strikes in the nation, thanks to its location next to the Pacific Flyway.

Now that Barack Obama is sworn in as President, he is expected to reverse the ban on federal funding for embryonic stem cell research. The resulting boom in this cutting-edge medical technology will benefit California's research institutes in a big way.

As the Bay Area has become more urban, many wild animals have disappeared. But not mountain lions. These large cats live surprisingly close to us, and yet they're not as dangerous as many believe. Now, researchers in the mountains north of Santa Cruz are using new technology to learn more about these elusive animals.

The Bush Administration has recently passed dozens of so-called "midnight regulations" - last-minute rules and amendments. Many of those new laws affect the environment, including a change to the Endangered Species Act that has California environmentalists deeply worried.