Davis Guggenheim wasn't a film director.
An Inconvenient Truth is a 2006 American documentary film directed by Davis Guggenheim about former United States Vice President Al Gore 's campaign to educate citizens about global warming via a comprehensive slide show that , by his own estimate made in the film , he has given more than a thousand times . Davis Guggenheim . Since 2006 , Guggenheim is the only filmmaker to release three different documentaries that were ranked within the top 100 highest-grossing documentaries of all time ( An Inconvenient Truth , It Might Get Loud , and Waiting for ′ Superman ′ ) .