The Giving Pledge: Warren Buffett, Bill Gates, Ted Turner Talk Philanthropy (VIDEO)

Over the summer, billionaires Bill Gates and Warren Buffett announced The Giving Pledge, a commitment to donate the majority of their fortunes to charity -- and to encourage other Americans to do the same.

Dozens of wealthy families have joined the pledge.

Buffett and Gates recently sat down with ABC's Christiane Amanpour to discuss their visions of philanthropy. Melinda Gates joined her husband for the interview.

Amanpour also spoke with media mogul Ted Turner, who has pledged his wealth away.