evan: devin, i really appreciate you stopping by. thanks. james: there's no question that the new england patriots have been the dynasty in an era designed for parity in the nfl. and coming up next on cbs, a special edition of "60 minutes" about people who are making a difference, followed by another special edition of "60 minutes," then "madam secretary" and" ncis." for boomer esiason, bart scott, coach cowher and tony gonzalez, i'm james brown. we'll see you at super bowl50 eeks froy. so ofs he time theds.

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>> whitaker: today, the wealthiest 400 americans are worth over $2 trillion. together, it's been reported they own as much wealth as the bottom half of american households combined. while resentment towards the super-rich grows, there may be a silver lining taking shape. it turns out a lot of those rich people are giving staggering sums of money away in what is being called a golden age of philanthropy. this surge in generosity is not by accident. much of it is the result of an ambitious and targeted campaign called "the giving pledge." it was started by an influential trio-- bill and melinda gates,

two years ago, charlie rose had the opportunity to get them together to learn more about their new club for billionaires. membership comes with just two requirements-- be worth at least a billion dollars and be willing to give half of that away. >> rose: is it necessary to join the giving pledge that you promise 50% of your net worth? >> melinda gates: yes, in your lifetime or in your will. >> rose: or in your will. >> warren buffett: right. >> rose: are people shocked by that? >> buffett: i don't think so. >> melinda gates: we're asking them to be bold. we're asking them to step out and to do something big. but a lot of them were already on their way there and just hadn't put a numeric number behind it. and i think now, also, the giving pledge has gotten going, people know that's the expectation. >> buffett: and we don't... we don't find a lot of people that say, "i want to join if it was 40%." ( laughter ) >> rose: some may say, "i'm happy to give much more than 50%." >> buffett: oh, most of them. most. my guess is that a very significant percentage of our... our members, i mean, way over half are going to give a lot

>> rose: that's certainly true of the founders. the gates have already committed to giving 95% of their wealth away; warren buffett, 99%. they say that kind of extreme giving is needed because the rich have been getting so much richer. tech innovations and rising global markets have produced vast fortunes not seen since the industrial revolution. so what does warren buffett say to convince today's billionaires to give their fortunes away? >> buffett: incremental wealth, adding to the wealth they have now, has no real utility to them. but that wealth has incredible utility to other people. it can educate children, it can vaccinate children. it can do all kinds of things. >> rose: there are others, and people that i know, say, "i want to give it to my children. that's what i want to do." what's wrong with that? >> buffett: i don't really think

confer blessings on generation after generation who contribute nothing to society, simply because somebody in the far distant past happened to amass a great sum of wealth. >> rose: so far, 115 billionaires have bought buffett's argument and signed the giving pledge. ages range from 27 to 98. some inherited wealth, but most are self-made. their businesses range from technology and social media to pizza, hair care, and home improvement. combined pledges so far? ov aala trillion dollars. what conditions are there? i mean, can they say, "yes, i'm with you. i'm here. but i want to give it to this institution or that institution." >> buffett: we don't care what institution they give it to. >> bill gates: yeah, in fact, we're not endorsing any flavor of philanthropy. we do think we're all going to be smarter and do it better learning from each other. but there is no pooling of money. we celebrate the diversity of philanthropy. >> rose: billionaires can be shy when it comes to talking about

but warren buffett helped convince seven who have signed the pledge to sit down with "60 minutes." they are investors pete peterson and nicolas berggruen, south african mining tycoon patrice motsepe and his wife, dr. precious moloi-motsepe, entrepreneur sara blakely, and a.o.l. founder steve case, and his wife jean. when did you first hear of the giving pledge? >> jean case: melinda called and talked to us. but we had the benefit of knowing bill and melinda for a long time, going back to our technology roots. >> steve case: we competed against them for many years. >> jean case: we did. >> steve case: and we're happy to finally join forces. >> rose: you wanted to be on their side. >> steve case: yeah, yeah, we wanted to be on the... aligned. >> rose: they've all signed the same pledge, and they bring the same brashness to their philanthropic ambition that helped them build financial empires. >> pete peterson: charlie, this is a group made up largely of entrepreneurs. and they didn't make a billion dollars or $billion by doing the ordinary; they did it by

>> rose: that's certainly true for sara blakely. >> sara blakely: well, i made all the money by making other people's butts look a lot better. >> rose: i think you've missed me. in 2000, she took $5,000 in savings and started the undergarment company spanx. now, she wants her philanthropy to be as cutting edge as her billion-dollar business. >> blakely: i started my product that didn't exist and shook up an industry. and i want to collaborate with people and increase my chances of coming up with an idea or something that will do that for my cause, which is helping women. >> rose: at 42, blakely admits she's just beginning to figure out how she'll help women. at 83, warren buffett says he wants to stick with what he's good at-- running his company, berkshire hathaway-- so he's given the bulk of his fortune to the bill and melinda gates foundation so it can be used to reduce global poverty and

as for the other pledgers, they're tackling an impressive array of causes-- unemployment in south africa, early detection and treatment of brain cancer-- and some interests that take on a more political tone: tax reform in california and the national debt. but as bill gates discovered when he left microsoft, going from making money to giving it away isn't always easy. an example of just one of the lessons he's learned-- it doesn't matter how effective a vaccine is; if you don't package and deliver it the right way, it will not do any good. i guess there's a learning process, too. >> melinda gates: absolutely. >> rose: because you feel like, "how do you do this even if you're inclined to do it?" >> bill gates: it's almost disconcerting to switch to an area where you're back at square zero a little bit. and the measurements aren't quite the same as in the business game. what you're trying to do-- the need to take risk, try different

encouragement. >> rose: that's why buffett and the gates invite pledgers once a year to exclusive resorts like kiawah island in south carolina. here, billionaires attend seminars on how to give money away more effectively. our cameras were not allowed in,

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