the howard g. buffett foundation focuses on world hunger, spending $50 million a year on projects like feeding programs in ethiopia and agriculture education in afghanistan. and he records it all through the lens of his own camera. >> you all of a sudden begin to kind of look around, and you notice there's a lot of people around that don't look too good. and, you know, they're hungry. and they don't have great living quarters. they may not have access to water. they don't have good sanitation. >> you were seeing farmers who couldn't feed themselves? >> oh, absolutely. i looked at that, and i thought, "you know, this is wrong. i understand agriculture. i should be able to do something about this." [ticking] >> coming up: the challenges of philanthropy. >> you know bill gates. have you said to him, "80% of what you're throwing down there in africa is not gonna work"? >> well, i've said it a little differently, i think, and that is that we need to quit thinking about trying to do it like we do it in america.

[ticking] [ticking] >> warren buffett, america's second-richest man, is a household name, his son howarderson warren buffett wants to succeed him as chairman of berkshire hathaway, the mega holding company that buffett built. like his father, howard does not live the high life. in fact, he's a farmer who would rather dig up the ground than sit in a boardroom. are you sure he's your son? >> well, i think that's worth checking out. you'll have a big exclusive. [ticking] [bell ringing] >> for 150 years, the floor of the new york stock exchange was