Osama speaking. Or is he?

An audio tape has been released allegedly from Al Qaeda’s leader Osama bin Laden. It’s the second in just a week.

In the broadcast he blames global warming on the United States and other developed countries.

He also calls on the world to abandon it's reliance on the U.S. dollar.

But RT contributor and investigative journalist Wayne Madsen says the tape is most probably a fake.

“The tape is a little bit suspicious like some of the other tapes we’ve heard,” said Madsen. “The voice speaks in a monotone, sounds like the voice is reading from a pre-prepared script. We know there’s a morphing technology available commercially that can make me sound like John Wayne. Most people in the intelligence community I’m talking to had the same reaction – this is fake.”