from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening. thanks for joining us. united nations secretary general ban ki moon says the climate change pact endorsed by close to 200 nations is a turning point" to make human life "sustainable on a healthy planet. world leaders are welcoming the agreement designed to curb planet-polluting carbon gases that have been causing a rise in global temperatures. the paris agreement approved yesterday commits countries to take steps that could cap the rise in temperatures to no more than two degrees celsius-- or just over 3.5 degrees fahrenheit-- over pre-industrial age levels. the pact aims for every country to reduce emissions from burning fossil fuels in the coming decades so the earth can naturally absorb them in the second half of this century. and under the agreement, countries will re-submit their pollution reduction targets to the u.n. every five years. the climate change agreement does not specify how its terms will be enforced, what happens when countries miss their targets, or how much money

hari sreenivasan spoke with the book's co-author, kathryn edin, a sociologist at johns hopkins university. their conversation is part of our coverage of poverty and opportunity in america, called" chasing the dream." >> sreenivasan: so how is it possible that you can actually get by on less than $2 a day in america? >> well, as it turns out it's not possible. we live in the most advanced capitalist society in the world, and a lot of countries that use this $2 a day rubric to measure extreme poverty, there is a rich barter economy. so you don't in some senses need cash, but in the us you really do need cash. >> sreenivasan: i am assuming that the food must be coming from pantries? >> about a half of the $2 a day poor do get food-stamps, that's a resource that people in the developing world of course don't have. it's a vital resource, but the sad thing about snap is that when you have absolutely no cash and your kids need socks and underwear for school or that backpack or the protractor for math class, you are going to trade in your food-stamps for cash, and that's the kind of barter that w

from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening. thanks for joining us. investigators today zeroed in on the pakistani woman who, alongside her husband, killed 14 people in wednesday's attack in san bernardino, california. law enforcement officials are now searching for connections between the two assailants and the islamic state group. the newshour's stephen fee has more. >> reporter: new details emerged today about 29-year-old tashfeen malik, who posted her allegiance to the islamic state on facebook the same day she and her husband, syed rizwan farook, opened fire on a holiday party for the san bernardino county health department, killing 14 and wounding 21. today, the official online radio station of the islamic state said the massacre was carried out by two "supporters" of the extremist group but did not claim responsibility for the attack. family and friends in the u.s. said they knew little of malik. her relatives in pakistan said she became a more devout muslim in recent years, switching from western clothing to more tradit

from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening and thanks for joining us. negotiators from nearly every country in the world unanimously agreed to a landmark agreement today to combat climate change, pledging to reduce their emissions from burning fossil fuels that cause global warming. it's the first-ever climate pact to commit all countries -- industrialized ones like the united states and developing countries like china and india - - to take action. delegates from 196 countries cheered as the gavel came down to end the two week conference. no delegation objected to the 31-page final agreement, which is set to take effect in 2020. the "paris agreement" aims to limit the rise in global temperatures to two degrees celsius, or three and a half degrees fahrenheit, over historic averages. to achieve that, the agreement calls on nations limit their greenhouse gas emissions to amounts the earth can absorb naturally by the second half of this century. and it requires countries to update their targets for reducing emissions by burning le

from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening and thanks for joining us. president obama has vetoed legislation intended to slow his policies on climate change. the bill would have nullified an environmental protection agency rule requiring power plants to reduce carbon emissions by one- third over the next 15 years. his "pocket veto"-- exercised after congress had adjourned for the year-- was expected. 27 states are suing to stop the rule. the president is in hawaii for his annual two-week family vacation in his home state. en route, the president and first lady stopped in san bernardino, california, to meet relatives of the 14 people shot and killed by a radical islamist couple at a holiday party this month. the meeting, behind closed doors at a high school, lasted nearly three hours. >> some described their loved ones who had come to this country as immigrants, others who had lived in the area all their lives. all of them extraordinarily proud of the work they were doing to keep people healthy and safe here in this community.

for perspective into some of the events of 2015 and what may lie ahead in 2016, hari sreenivasan spoke earlier with "financial times" reporter eric platt. >> sreenivasan: so this is such an enormous number. it's hard for people to get their minds around. why are these companies defaulting? or what's the primary reason? ear if there's a particular sector? >> sure, so one of the big thiks that companies were able to do over the past few years was take advantage of cheap financing and cheap debt with the federal reserve keeping the rate at zero, it wasn't hard for an energy company to get a 3% or 5% alone and commodity prices have tumbled. >> sreenivasan: the price of oil is a lot cheaper now than a year ago. >> exactly, and it's copper and iron and affecting much more than the traditional oil and gas companies drilling in the u.s. >> sreenivasan: so they borrowed from their creditors saying, "listen, we're going to be good for it. the price of oil is going to go up and the price of commodities will go up, and it didn't." >> exactly, with oil at about $35 a barrel now, they're settling ma

i'm hari m sreenivasan. thanks for watching. have a good night. >> pbs newshour weekend is made possible by: lewis b. and louise hirschfeld cullman. bernard and irene schwartz. judy and josh weston. the cheryl and philip milstein family. the citi foundation. supporting innovation and rn enabling urban progress. sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. additional support has beenee provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. [ mid-tempo music plays ] steves: riding this gondola, you soar, landing in the sleepy, unpromoted village of gimmelwald. in 30 years of researching guidebooks, i've found hidden gems like this in every country. gimmelwald would have been developed to the hilt, like neighboring towns, but the village had its real estate declared an avalanche zone, so no one could get new b

from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening and thanks for joining us. a key region in afghanistan could be on the verge of falling to the taliban. the deputy governor of helmand province, an area that u.s. troops once fought to secure, says urgent action is needed to prevent its collapse. the official posted an unusual public plea to afghan president ashraf ghani on facebook saying, quote: "helmand is standing on the brink, and there is a serious need for you to come." the helmand official said he had lost 90 soldiers in the past two days and hundreds more during six months of taliban attacks. a spokesman for president ghani said the president is aware of the facebook post and met with his national security council about the situation. an afghan army spokesman said helmand would never collapse. air france says a bomb scare that forced a passenger jet to make an emergency landing in kenya today was a false alarm. the plane was en route from the indian ocean island of mauritius to paris when a passenger reported a suspicious dev

merab, this is my friend hari, from the united states. >> sreenivasan: hari. pleased to meet you.troduced me to his host for the night before i arrived, merab saaladze, a retired deputy governor of the local municipality. you just invited him into your home? he's a total stranger? >> ( translated ): i asked him who he was and he said he was from the u.s., so i immediately invited them in. >> sreenivasan: is it common to be this hospitable to take in a stranger? >> ( translated ): for me, it was the first time. >> sreenivasan: after tea and a bit more conversation, we set out for the next waypoint: the ancient village of dmanisi - which we'll tell you about in our next story - about six miles away. >> so, basically, there is no shortcut. merab said, well, yes, you have to cross the river. >> ok. >> sreenivasan: but, as we soon found out, even the most precise directions need updating, which we were given by a man with hands stained from a lifetime of gathering walnuts. and that, says salopek, is just part of the plan. you've got g.p.s., you've got maps, you've got guides, you are s

tonight, we take another look at hari sreenivasan's visit-- and walk-- with paul, as they trace the footstepsy man on his global trek. >> sreenivasan: the fog-shrouded fields and rolling hills of southern georgia are much more than a waypoint for paul salopek. we were nearing the ancient city and archaeological site of dmanisi. >> so, dmanisi is finally in sight, and this is probably one of the most important human migration sites outside of africa proper. >> sreenivasan: salopek is following the path humans took after the ice age, 70,000 to 100,000 years ago. but here in dmanisi, that path is much older. along these green and jagged river gorges, we have walked in one form or another for nearly two million years. the history here is stacked high, part of what salopek calls the layer cake effect of the caucasus. with a happy dog welcoming us, we passed what was likely an outer defensive tower of the 1,400-year-old city of dmanisi. this has been a crossroads for a long time. >> from day one. and pretty much everybody invaded it. >> sreenivasan: and was this a trading route? >> this was a silk

hari sreenivasan is on the scene. , there are so many loose ends and one seems to be at the local f.b.i. folks on the ground will not rule out terrorism. >> that's right, and the most recent press conference, the f.b.i. said they can't rule it out, they can't rule it in, but at this point they say they will go where the investigation leads them and that could be domestic terrorism, that could be something more, but right now they just don't know enough about exactly who these people were and what their motives were behind the attack today. >> ifill: seems tube they are still examining and searching the building where this all took place. what are they looking for? >> sreenivasan: well, right now they are looking for any clues as to what these people left behind, was there anything else, was there any sort of explosive device. that was one of the concerns earlier this afternoon. in fact, there was even an object next to the suv where the shootout occurred and they spent quite some time making sure that wasn't an explosi

for more, we go to hari sreenivasan. >> sreenivasan: and with me to explore the details of this deal,t's at stake, and the long road to this point is chief foreign affairs correspondent margaret warner. how big a deal is this? >> it's a big deal. you have all the members of the security council, not just the members to have the region who have been involved. some agree on resolutions setting up the process that will set up not only a cease fire between assad and many of his opposition groups on the ground but direct talks between the two of them. and ban ki-moon secretary general committed to help. >> sreenivasan: so a lot of countries working toward this, but there are four major players and in the middle is bashar al-assad. >> that's right, the major division among many concerns his future. on one side, you've got the united states and the gulf states who began all this wanting assad gone as soon as possible, and both have supported opposition groups on the ground in different ways. but on the other side you've got russia a iran, both of them regard syria, and syria is a client stat

and to hari sreenivasan. >> sreenivasan: on august 11, 2008, an 18-year old washington woman reported she had been raped at knifepoint in her apartment. days later, after police questioned her about inconsistencies in her story, the woman said she made the whole thing up. except, there's more. "an unbelievable story of rape" is the joint effort by two non- profit news organizations, the marshall project and propublica, to tell the tale of how two very different police departments treated the investigation. we are joined now by co-author ken armstrong, a staff writer for the marshall project. he joins frus seattle, ken, i want to ask, i want to tell our audience that we are going to talk about the ends of this story as well f they hadn't read it yet. but what happens to this woman when she goes into a police department in linwood, washington, and tells them this she has been raped? >> well, she tells police that she was raped. and initially there is no indication that plition doubt the truth of what she is telling them. but quickly, as soon as one day after, she reports being raped, do

hari sreenivasan reports from san bernardino. >> sreenivasan: this morning, a bullet-riddled s.u.v. sat in a san bernardino street, stark evidence of wednesday's violence.ç the fwo suspects, syed farook and his wife, tashfeen malik, died there in a gun battle with police, after a chase. hours earlier, the pair opened fire at a social services center during a holiday luncheon. police swarmed in to track the husband-and-wife team, ending in the final shootout a few miles away. police chief jarrod burguan says the couple had an arsenal in the s.u.v., including two rifles and two handguns -- all legally purchased -- and bullets that could punch through police >> suspects are believed to have fired about 76 rifle rounds aton of the pursuit. 76 is our number we have right now, however on them on their person and in vehicle they had over 1,400 .223 caliber rounds that were available to them and had over 200 .9 mm rounds on their persons as well. >> sreenivasan: in addition,ç investigators found three pipeç bombs at the social services complex, attached to a remote controlled car that ma

hari sreenivasan has our story from new york. >> my name is brandon stanton.un the web site "humans of new york" and i stop random strangers on the streets of new york and i learn their stories. >> sreenivasan: in five years, brandon stanton has learned and shared the stories of thousands of people. so how often do you shoot? every day? >> every day, yeah, got to keep the blog going. if i stop shooting, the blog stops. >> sreenivasan: the blog doesn't stop. 16 million people see his portraits and the captions that go with them on facebook. another 4.4 million follow along instagram. >> i'm always looking for the thing that makes them unique. i mean, i'm never really looking for the thing that makes somebody the same as everybody else because, you know, i've interviewed 10,000 people so. in order to keep my blog interesting, i need to find something different about that person. >> sreenivasan: are you amazed by how much a stranger is willing to share with you? >> oh, all the time. when i first started, i didn't even think a stranger would let me take a photo. n