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Experts disagree on whether Katrina's floodwaters are the source of the high levels of contaminants in New Orleans' soil, or if the contaminates were there before the storm. What's not in dispute is that the lead, arsenic and other hazardous chemicals found in older neighborhoods needs to be cleaned up.

The New York Civil Liberties Union is pushing to protect Syracuse residents from the harmful construction process of renovating Interstate 81.

California Gov. Arnold Schwarzenegger endorses measures to reduce greenhouse gas emissions statewide. California's air quality goals have implications for industry and auto makers because they often lead to a ripple effect for laws across the country.

The Freedom of Information Act made it possible for the Associated Press to acquire the video of President Bush's pre-Katrina teleconference. Similar releases have resulted in big stories, but journalists say it has become harder to get government documents through the use of this act.

President Bush meets with Mexican President Vicente Fox and new Canadian Prime Minister Stephen Harper in Cancun, Mexico, for talks. Immigration and border security -- and the balance between the two -- are expected to dominate the two days of meetings.

A coalition of botanists, farmers, chefs and anthropologists is working to catalog North America's native foods -- from the mule deer to the tepary bean. The goal is to preserve food traditions among local chefs and gardeners.

Hog farms are known for their odor. But so far, no one has paid much attention to whether these smells actually pollute the air. Now, the Environmental Protection Agency is testing chicken and hog farms for gases and particles that can make air harmful to breathe.

The Environmental Protection Agency is proposing to change the way it tests gas mileage on cars, starting with most 2008 models. The changes are meant to make mileage estimates more accurate. Renee Montagne talks to Paul Eisenstein, publisher of the Internet magazine The Car Connection.

The winners of the Newbery and Caldecott children's book awards will be announced Monday. Host Debbie Elliott and children's literature expert Eden Ross Lipson discuss the world of children's publishing.

New Orleans residents who live along the 17th Street Canal say water was leaking from the canal and into their yards months before Hurricane Katrina. Investigators say a leak may have been an early warning sign that the soil beneath the levee was unstable and may help explain why it collapsed.