Rove debates warming with Crow, David

WASHINGTON (AP) — Their college tour ended,

Sheryl Crow and Laurie David describe their efforts to stop global warming as part of the "most important mission" of the times. That's the hope of Grammy-winning rocker Crow and David, who produced "An Inconvenient Truth," the global warming movie that won the Oscar for best documentary.

"It's great to go out and play music, and I love that, too. And it's also nice to make money. But this is not that," Crow said in an interview on Sunday. "This is a whole bunch of people dedicating their time, their lives, working for free, for a mission. And it is the most important mission."

The pair rode a biodiesel bus on an 11-stop college tour to raise awareness about global warming by engaging students on the topic. It began earlier this month at Southern Methodist University in Dallas, and was timed to end on Earth Day.

Crow and David spoke before appearing at the tour's last show at George Washington University with country stars

Tim McGraw and

Faith Hill. Singer

Carole King and David's husband, Larry, along with environmental advocate Robert F. Kennedy Jr. also were on hand.

Laurie David said that "federal inaction is no longer acceptable" and they are pressing for Congress to enact a bill to impose mandatory curbs on carbon dioxide and other greenhouse gases within two years. She predicted the 2008 election would revolve around three main issues: jobs, terrorism and temperature.

"I just feel like if this isn't addressed by this administration, if this administration isn't hearing this message loud and clear, then I feel like there's an irresponsibility," Crow said.

The two women also planned to meet with House Energy Chairman John Dingell (news, bio, voting record), D-Mich., and Senate Majority Leader Harry Reid (news, bio, voting record), D-Nev., on Monday.

They unsuccessfully tried to change the thinking of Karl Rove,

President Bush's top adviser, at a correspondents' dinner Saturday night. "I honestly thought that I was going to change his mind, like, right there and then," Laurie David said.

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