for the pbs newshour, this is fred de sam lazaro, in bunagan uganda. >> woodruff: fred's reporting it a rship with the under-told stories project at the university of st. thomas in minnesota. >> woodruff: there are 15 democrats vying for their party's 2020 presidential nominaseon. one of tandidates, governor jay inslee of washington, joins us now. governor welcome. governor, welcome to the newshour. >> thank you, this is an honor, thank you. >> woodruff: well, thank yheu for beine. so you are making climate change a centerpiece ofcaoumpaign. you asked voters about it. many of them agree it's important. but it is not numbe when they look at what's most important in choosing a president. ce action if it's not a top priority for people? >> well, actually, it is actually becomi a top priority. actually, there was a poll in iowa showing this was the toppr rity for democratic voters, certainly, now tied with health care. and this is chaenging in th american public because we are witnessing paradise, paul, burning down to the foundations. we're seeing the floods ins nebraska, uri and iowa th

. >> nawaz: for those stations staying with us, special correspondent fred de sam lazaro has this encoreort from kenya's capital, nairobi, where mapping technology is helpingbr g services to some of the poorest people on the continent. >> reporter: in the that forms africa's largest urban slum, zack wambua's job is to keep an eye on the nooks and corns. he's with a group of residents in nairobi's kibera neighborhood who've beetrained in basic computing technology to record where things like electrlial lines, pubtoilets and community water tanks are, and, more critically, where they are needed.ga >> so,, just pick a point here. >> reporter: on this day, he was checking on streetlight locations using a small gps device. >> these are t coordinates. >> reporter: so, having a light he is very important to th security of the families that live in this area back here? >> yes, yes. >> reporter: at the end i his day, thenformation is added to a database. it's all designed by an organization called map kibera, which provides the information free of charge, so that publican private groups can bette