Former Vice President Al Gore, the star of a documentary derived from his slide show on global warming, is about to begin training 1,000 "Climate Project" volunteers to help spread his environmental message around the globe.

Gore has been promoting his documentary and book "An Inconvenient Truth" and encouraging volunteers to apply for his training sessions to learn how to give a shorter version of his PowerPoint-style presentations.

Several thousand have already applied to be among the 1,000 volunteers Gore expects to train within the next six months, said spokeswoman Kalee Kreider. The first session with about 50 volunteers begins this weekend in Nashville, Gore's hometown.

Gore, a Democrat who lost the 2000 presidential election to George W. Bush, has criticized the lack of action on global warming by politicians across the ideological spectrum.

The wave of publicity about his initiative has raised questions about whether Gore will run for president again in 2008. Gore has said he has no plans to become a candidate, but he has not ruled it out either.

Gore plans to participate in the instruction at the sessions but will also have scientists and other experts help train the activists, Kreider said. There are no plans to hold any sessions outside Nashville.

Activists will have to pay their own airfare and accommodations, but the training sessions -- which are expected to run Sundays through Tuesdays -- are free. Scholarships will be available for some participants, Kreider said.

Annapolis, Maryland Mayor Ellen O. Moyer is among the initial group of activists heading to Nashville.

"I'm honored to be a part of this first training program," she told The (Baltimore) Sun. "There comes a point in time when we have to say, 'Enough is enough."'