NASHVILLE — Former vice-president Al Gore, the unexpected film star of a documentary derived from a slide show, is about to begin training 1,000 "Climate Project" volunteers to help spread his global-warming 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. <A TARGET="_blank" HREF="http://adsremote.scripps.com/event.ng/Type=click&FlightID=2035536&AdID=2044432&TargetID=2019127&Targets=2011020,2003385,2020041,2011361,2022424,2011448,2019991,2017830,2011669,2019127&RawValues=&Redirect=http:%2f%2fwww.advertisersite.com"><IMG SRC="http://images.scripps.com/1x1.gif" WIDTH=336 HEIGHT=280 BORDER=0></A> 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...