Julia Roberts Promotes School Bus America on Oprah

Julia also says being a mom has made her think more critically about global issues. She was recently featured on the cover of Vanity Fair magazine as part of the "Green Team," along with George Clooney, Robert F. Kennedy Jr. and Al Gore, to promote environmental awareness.

"It's motherhood really urging my consciousness along into different places," she says. "What is the world going to be like for all of our children?"

Julia drives a hybrid car and even makes sure to recycle plastic grocery bags. "Reduce, reuse, recycle," Julia says. "Just like Jack Johnson sings in Curious George."

Julia is also involved in a program called School Bus America to try to get school buses across the country to switch from diesel fuel to biodiesel. "Our kids are inside those buses where it's so much more toxic and deadly," she says. "And it's so easy. All these buses can be changed over to biodiesel and vegetable oil."

Check out our Earth Biofuels' newly launched www.schoolbusamerica.com site.

You can learn more about Julia Roberts' role as spokeswoman for Earth Biofuels by clicking here.