TED 2009: Al Gore presents updated slides that show climate trends are much worse than scientists predicted, and expose the deceit of "clean coal" (7:45).

On July 17th, 2008, at Constitution Hall in Washington D.C., former Vice President Al Gore said America's "dangerous over-reliance on carbon-based fuel" is at the core of its economic, environmental and national security problems and called for a complete shift to Earth-friendly energy sources in the next decade.

The film, "An Inconvenient Truth" has taken the tactic of a slow release, building with word of mouth, and is doing unusually well for a documentary. Al Gore has been on every show everywhere since mid-May, patiently and passionately starting from scratch and walking through the issue again and again and again. And he doesn't even take the bleakest position, but what he believes is, never-the-less, extremely alarming.