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That, the what was just -- >> did you sense that? >> just a little bit. so the country's most famous billionaires are making a public declaration and moral commitment. cnn's lisa sylvester will explain why they have agreed to do this very, very generous pledge. >> reporter: they are all billionaires, many of them household names. buffett, gates, rockefeller, bloomberg, and they've taken a public pledge to give at least 50% of their wealth to charity. it began with warren buffett and bill and melinda gates, all three have already committed vast sums of their wealth to causes such as global heal...

Very unique pledge. lisa sylvester has been looking into the story for us. tell the viewers what is going on, lisa? >> well, wolf, something to keep in mind, this is not a legal contract, but a public declaration, and as they put it, a moral agreement or commitment to leave at least half of the net worth to charity either when they are alive or upon their death. >> well, keep moving. >> reporter: they are all billionaires and many of them household names. buffett, gates, rockefeller, bloomberg and they have taken a public pledge to give at least 50% of their wealth to charity. it began with wa...

That even with giving away half, it still leaves them a lot to go around. >> all of the billionaires on the forbes 400 list were to give half of the wealth, that is $600 billion to go to charity and philanthropic causes. that is a fantastic amount, and if it were to go to help the world's poor, it could make a huge difference. >> reporter: now the giving pledge is not meant just for the mega rich, but to inspire others, and even those without deep pockets to give what they can. wolf? >> thank you. and you are in "the situation room." happening now, a number of americans charged with aiding o...