Billionaire Jeff Greene, who amassed a multibillion dollar fortune betting against subprime mortgage securities, says the U.S. faces a jobs crisis that will cause social unrest and radical politics.

"America's lifestyle expectations are far too high and need to be adjusted so we have less things and a smaller, better existence," Greene said in an interview today at the World Economic Forum in Davos, Switzerland. "We need to reinvent our whole system of life."

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Greene, who flew his wife, children and two nannies on a private jet plane to Davos for the week, said he's planning a conference in Palm Beach, Florida, at the Tideline Hotel called "Closing the Gap."