Sheryl Crow has headed back to school to dialog with college students about the growing problem of global warming. Crow and environmentalist Laurie David (wife of comedian Larry David) are in the mids

Sheryl Crow has headed back to school to dialog with college students about the growing problem of global warming. Crow and environmentalist Laurie David (wife of comedian Larry David) are in the midst of a bio-diesel bus tour through U.S. college campus that visits Birmingham, Ala., tonight (April 13).

The issue is a personal one for Crow, whose family has owned a home on the Gulf Coast of Florida since she was a toddler. "There have been several really bad shark attacks in the last three years up on the Panhandle, which is where our house is," she tells Billboard.com. "Come to find out, from talking to the fisherman, that the cold water was registering at 89 degrees! That's frightening, when you make the correlation between that and Katrina, knowing that warm waters mean colossal storms. It only looks to be worse in the future. That is really what propelled me toward this issue."

At the campus events, Crow is performing songs like "A Change Will Do You Good," "Everyday Is a Winding Road" and "Soak Up the Sun" acoustically with guitarist Tim Smith. "I think we bring a little bit of comedy to the evening, but really, the objective is to light a fire under everybody, to propel this environmental movement," she says. "We open up the floor to questions and answers, to have a dialog with students. We also want people to be part of a campaign toward leadership, and vote for people who are environmentally conscious."

While on the road, Crow and company are being trailed by a documentary film crew. "We're hoping to make a documentary, kind of following up [the Al Gore film] 'An Inconvenient Truth,' about what you can do on a personal level and in your businesses," she says.

The Stop Global Warming College Tour wraps on Earth Day (April 22) in Washington, D.C. The next day, Crow and David "will be up on Capitol Hill, talking to some Congressmen about plans for the future."

As for Crow's own musical future, she was tight-lipped about her next studio album, which will reportedly have more of a country slant than past efforts. "I'm finishing it now and I'm hoping it will be out before Christmas," she says. "There's a song on there I'm hoping will come out first, which is very environmentally conscious, in the tradition of Bob Dylan. That's another objective of mine; I'm really encouraging artists to write about what's going on, because we seem to be very distracted by some lightweight topics. I think it's time to start writing about the reality of what's around us."

"There are a couple of surprises on it," she continues. "Until I'm ready to start talking about it, I'm not going to say very much. But people will be very surprised. I'm working with some very interesting people."