[woman speaking native e langua] [child crying] reporter: there's heartache for others. we uncover an ugly trade. woman: i think these are cockroaches. they're all over the side. reporter: and confront those responsible. how many children that you oversee the birth of, through your company, are bornrn with brain damage?

speaking native language] [woman laughs] [shamata speaking native language] [woman spepeaking native langua] [woman speaking native language] favdi: it's very empowering, as youu can see, because you are picking the women who doesn't even go out of the village, but they are coming all the way here. after 5 months, they become solar engineering. they go to the village they electrify. it's very powerful. very, very powerful. castico: the dirty business of staying bebehind and waiting for my husband to bring something home is no longer there. even the husbands, they are confessing that. when my wife wanted to start going to the college, i rerefused. but when e came back, oh, there was a lot of love. [hajq speaking native language] [woman speaking native l langua] narrator: while the training students are receiving at barefoot college in tanzania serves asas a model f for other, southern c california continueso be a pioneer in solar technology. man: pollution causes harm to all of us. it's not just an abstract thing. and communities of color, low-income communities, even women versus men dispro

[woman speaking native e langua] [child crying] reporter: there's heartache for others.cover an ugly trade. woman: i think these are cockroaches. they're all over the side. reporter: and confront those responsible. how many children that you oversee the birth of, through your company, are bornrn with brain damage?