Coming up on 'This Week'… Warren Buffet, Bill Gates, Ted Turner and Tom Steyer on their Giving Pledge

(ABCNEWS.com)

On a very special "This Week with Christiane Amanpour" – why do four men who are among the wealthiest people in the world plan to give away the bulk of their vast fortunes?

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Berkshire-Hathaway Chairman and CEO Warren Buffett, Microsoft founder and Chairman Bill Gates and his wife, Melinda Gates, of the Bill and Melinda Gates Foundation, CNN founder Ted Turner and hedge fund manager Tom Steyer sit down with Christiane Amanpour in a "This Week" exclusive and explain their reasons for making the Giving Pledge – a commitment by some of America's wealthiest individuals to give the majority of their wealth to philanthropy. Joined by 40 billionaires, boosting diverse causes such as education, the environment, AIDS, human rights and nuclear arms reduction these visionaries offer their insights on changing the world.

Plus, these top American business minds give their views on fixing the struggling economy, taxing the rich, deficit spending, innovation and the next big thing. Buffet, Gates, Turner and Steyer -- Sunday, on a special "This Week". You won't want to miss it.