their verbal attacks as our ian lee in saudi arabia gets to see the damage done by last week's oil strikes. democrats trade places. >> hello, iowa. >> a a new poll shows a shakeup in a key battleground state. shifting gears at gm, dean reynolds talks about technology and their future. >> you're going to need people to build vehicles.

birds are disappearing by the billions. what's emptying the skies. and taking the field. taking on the taliban by playing hard on and off the field. >> we are the new generation of afghanistan. welcome to the "cbs overnight news". for the first time president trump suggested that he did discuss former vice president joe biden and his son during a phone call with ukraine's president. the issue sparked a new political fire storm for the president following him all weekend including stops in two states before arriving in new york. nicole kiln yan has tlatest fro the white house. . >> reporter: as he departed the white house, president trump continued to face questions over a phone call with the irukraini

president. >> it was largely all the corruption taking place. it was lrgely the fact that we don't want our people like vice president biden and his son creating the corruption already in the ukraine. >> reporter: the july 25th call ignited a plilt call fire storm following a whistleblower complaint. during the call the president reported him to investigate biden's son who worked for ukrainian gas company. >> there was no quid pro quo, nothing. >> reporter: he denied and he's okay with his attorney testifying before congress. >> what they are trying to say is i went there for a plut call mission to get joe biden in trouble. ridiculous. >> focus on the violation of the

constitution. >> reporter: biden has denied skusing his son cease job overseas. >> he was protecting his son and intervened in a way that was corrupt, we need to get to the bottom of that. >> reporter: some in the administration suggested biden should be investigated, democrats argued if the claims against the president are proven, impeachment is the only option. >> if the president is withholding military aid at same time trying to brow be a foreign leader to provide dirt during his opponent, that may be the only remedy that is coequal to the evil that conduct represents. >> ukraine says no pressure was put on its president. he is expected to meet with trump later this week during the u.n. general assembly. >> nicole week congress will hear from the acting director of national intelligence about the whistleblower complain this. what can we expect from all of

that? >> nancy pelosi expects the acting direct director not only to during over the complaint but to allow this whistleblower to speak. so far, she has resisted calls for impeachment, but did warn of a whole new stage of investigation if the administration does not comply. >> nicole, thank you. now to escalating tensions in the middle east. today iron's president called on western nations to, quote, stay away from the persian gulf. at the same time, the sparring goes on including threats of an all-out war over who is responsible for last week's attack on oil facilities in saudi arabia. ian lee is in riyadh. >> reporter: what started out as an attack on two saudi oil facilities leaving twisted metal and burnt out fuel tanks has turned into a war of words. iran's president said today the u.s. is creating an arms race in the region. while iran's foreign minister told face the nation it could

lead to conflict. >> i'm not confident we can avoid a war. i'm confident we will not start one. >> reporter: secretary of state mike pompeo shotback. >> iran's foreign minister repeatedly denied any part played by iran in this attack. will the u.s. release evidence that proves he's lying? >> well, we already have. there's ample evidence that demonstrates he's lied. the saudis showing systems built and manufactured inside of iran. >> reporter: this week saudi arabia showed us what they said is the evidence tehran was behind the attack despite the rebels claiming responsibility. the blast marks on the refineries point north. you can see five of these towers and when you look at the damage done, you can see that it's pointing in the northwesterly direction. that's likely where the projectiles came from. officials claim the pieces of drones recovered were made in

iran. but a team of u.n. investigators is in the country independently inspecting saudi arabia's claims. tonight the tensions are still high. united states says the additional troops are taking a defensive posture, but iran continue to warn that any strike against the country will see swift and broad retaliation. >> ian lee, thank you. now on the road to 2020. a new poll of likely democratic voters in the iowa caucus shows a change at the top, at least for now. the des moines register poll shows elizabeth warren leading joe biden by 2 points. bernie sanders is a distant third. ed o'keefe is on the campaign trail in waterloo, iowa. how is the new poll playing among the campaigns? >> reporter: well, this is the first significant lead change. the fact that biden has slipped to second is notable. he has universal name recognition, but you talk to people in the state and they

credit warren and her team for building out an operation that is increasing her support. we shouldn't put too much into polls this early in the cycle, but the polling done by the des moines register through the years is often the one that ends up predicting the winner, which is why this poll gets extra attention. >> that's a good point. the polls a shows that just 1 in 5 iowa voters say they made up their mind about who to support. is that what you're hearing? >> reporter: it is. take the example of a woman we met earlier today who said she would love to see elizabeth warren and pete buttigieg end up on the ticket together, but she's a fan of amy klobuchar. and she's okay with biden too. indecisive voters have 134 days to decide. >> ed o'keefe, thank you. here in new york, a landmark summit on climate change takes place tomorrow. yesterday teen activist of

sweden who has mobilized millions of young people around the world

both joe biden and elizabeth warren joined striking gm workers on the picket lines today. the former vice president was in kansas city, kansas. warren was with workers in detroit preponderance the nationwide walkout isn't just about the terms of a new contract, but about big changes down the line. >> reporter: as negotiations proceed at this detroit hotel, difficult questions are demanding answers as. michelle krebs is an executive analyst with cox automotive. >> how many jobs will exist because of electricss of real ce

for the out future. >> reporter: electric vehicles still an unusual site on the nation's roads are gathering momentum. gm plans to introduce 20 new all electric models by 2023. a major uncertain step away from gasoline or diesel power. electric batteries and motors are much simpler to make than the internal come bungs engines. that means fewer works on the factory floor and fewer workers needed to keep the vehicles running once sold, which in turn means lesds profits for dealerships and mechanics and along the picket line one member thinks there's a bright side. >> you're always going to need people to build vehicles. >> reporter: the coming transformation is undenial. >> we know electric vehicles, new ways of us acquiring personal transportation is going

to happen. we don't know when that will be, and we don't know when anyone is going to make money on it. >> reporter: big questions in need of answers and not just for auto workers. dean reynolds, cbs news, new york. a landmark takes place tomorrow. gretta, who organized millions of young people, received a raw cuss welcome. many world leaders will also attend the summit, butt united states is only sending a low level state department official. in the atlantic tonight, two tropical storms are churning and could cause trouble. forecasters predict karen on track to cross puerto rico and the virgin islands will dump up to 4 inches of rain there tuesday night. the islands of trinidad are already feeling the wrath of karen with heavy rain and 40 mile per hour wis.tral jer c hit already battered bermuda with more rain and high winds on tuesday. we're kicking off a new series.

medical price roulette. it's an in-depth look at why hospital and health care bills can vary so dramatically taking patients by surprise. one doctor sade he needed emergency back surgery or could face paralysis. then over $650,000 in bills arrived. >> it was my choice. be paralyzed for the rest of my life. it was bad enough being out of work and not being able to make a paycheck. but then to get bills so overwhelming, you say this can't be real. i don't have to pay this. how am i going to pay this. you sit there and kblyou start christing because you don't know what to do. you have no sense of reality anymore. you don't foe what you're going to do. >> our new series begins on "cbs this morning" and on the evencb

evening news. for five years she's remained anonymous and silent. but now chanel miller is speaking out about being swaully assaulted by brock turner. in an interview with 60 minutes, she talks about the outrage at the sentence and to overcome feelings of guilt and shame. >> reporter: as chanel spoke directly to her assailant in court, she says she noticed people crying. brock turn herb wouldn't look at her. >> your damage was con crete. stripped of titles, degrees, enroll the. my damage was internal. unseen. i carry it with me. you took away my worth, my privacy, my energy, my time, my safety, my intimacy, my confidence, my own voice until today. >> reporter: after she spoke her last words, the judge handed

down his sentence. citing the defendant's good character, the fact he had been drinking and the impact prison would have on his life, the judge sentenced turner to six months in jail with good behavior he'd walk free in 90 days. >> the prosecutor had been asking for six years. >> yes. >> how did that hit you? >> i in shock. you're saying i just put aside a year and a half of my life so he could go to county jail for three months. there are young men, particularly young men of color, serving longer sentences for non-violent crimes for having a tiny bit of marijuana in their pockets. he's just been convicted of three felonies and he's going to serve one month for each low ou?

>> next, why spar rows, blackbirds and finches all familiar birds might be facing extinction. something great from mr. clean.

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(li juet you mixedup with tu of course i know your name. what's his name? what's your name? switch to geico®. you could i want this to be over. wild birds are disappear in at an alarming quarter rait.

a quarter of population has vanished in the last half century. jonathan vigliotti has more on tonight's eye on earth. >> how accurate are these numbers? >> extremely accurate. >> reporter: the bird population dropped by 3 billion in just 50 years. the alarming die off outlined in a new paper. peter mara, author and director of the environmental nirktive, called it an environmental crisis. >> this needs to be a wakeup call. it's time people did wake up and started taking care of their environment like we need to do. it's an environment we also depend on. >> reporter: the study brought together information gathered since 1970. much of it collected by thousands thousands of bird enthusiasts from across the u.s. and canada. hardest hit grassland birds lker spar rows losing more than half their population. and shore birds seen in coastal regions, where population has

fallen by more than a third. researchers aren't sure what's making birds so vulnerable, but point toans forotential reasons of the destruction of natural habitat and use of toxic pesticides. >> when we lose them, it's like burning. it's tearing down our museum. we're losing our heritage. future generations will not be able to share watching these big flocks of birds that we once watched. >> it tells us we're a little sick. we need to get back on the mend. >> reporter: the director of the aud bonn center for wildlife minutes from downtown los angeles. >> birds are important because they tell us a story about our environment. just based off the birds that you see present in the community. the ka na ri in the coal mine. >> it'sigonservation efforts on a legislative level has to happen now. >> i think of these birds as the rem brants, the mo'nes, they are

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for a a new president. whoever wins will be in dharge of attempting to negotiate first a cease-fire and then some form of shared government. that could undermine gains made by afghan women not just at the ballot box but on the playing field. charlie d'agata has the story. >> reporter: for these young women in kabul, soccer has never been just a game. >> actually, when i play football, i feel free. >> when you play soccer, it makes you feel free. >> yeah. >> reportedom is now under threat. women here fear their liberties will be sidelined in any taliban negotiations inviting a return to a dark past. under taliban rule, women weren't allowed to leave the house without a male companion. the idea of young women playing soccer here in kabul would have

been unthinkable. she was an saspiring medical student when the taliban overran kabul. >> they have banned education for all girls. the city was like a graveyard. >> reporter: she says she had had lost hope until 9/11 changed everything. >> i'm sorry to say this, but what happened in 11 september was beginning of somehow a liberty to the woman in afghanistan. because at least you could walk after the taliban collapsed without the fear of being beaten up by taliban. >> reporter: she's still leading the charge for afghan women the right to study, to govern and play soccer. >> we want to show the people that we are the new generation of afghanistan. >> worth fighting for.

charlie d'agata, kabul.

we end with news out of washington that every american can sell britt. tourists lined up this weekend to get to the top of one of the most cherished landmarks. it's been closed for repairs for three years. >> reporter: the washington monument, a symbol of american unity, beckens visitors from across the world. but for nearly a decade, it's been closed more than open. >> why did it take so long were. >> we're dealing with oneself of the most iconic and historic properties in our country. it takes time to do everything right. >> reporter: the 2011 virginia earthquake shook the monument to its core cracking stones and showering debris on scattering tourists. >> the big fear was the monument itself would fall or lit

literally large pieces of rock would be coming off the monument. >> reporter: inspectors later repelled down the monument before scaffolding during repairs. >> the crack goes all the way through. >> reporter: just as those repairs were completed, the elevator broke sometimes stranding visitors. another round of upgrids delivered a new security skraening center and a whisper quiet elevator that takes you to the top in about a minute. >> the whole project took about three years. >> reporter: from the observation deck, the national mall reveals the beauty one window at a time. >> kind of breathtaking. >> it's spectacular. >> reporter: a spectacular view for all to share once again, cbs news, atop the washington monument. >> that's the "cbs overnight news" for this monday. for some of you, the news continues. for others check back later for the morning news and "cbs this morning." from the broadcast center, i'm adrian na diaz.

this is the "cbs overnight news." >> welcome to the "cbs overnight news." i'm adriana diaz. for the first time, president trump suggested he did discuss joe biden and his son during a phone call with ukraine's presidents. the issue has sparked a new political fire storm for the president following him all weekend including stops in two states before arriving in new york. nicole kiln yan has the latest fromhe > house, psiderump d actionover a phone call with the ukrainian president.

>> it was largely all the corruption taking place. it was largely the fact that we don't want our people like vice president biden and his son creating the corruption already in the ukraine. >> reporter: the july 25th call has ignited a political fire storm following a whistleblower complaint. during the call the president reported him to investigate biden's son who worked for ukrainian gas company. >> there was no quid pro quo, there was nothing. >> reporter: he denied and he's okay with his attorney rudy joule, giuliani, testifying before congress. >> what they are trying to say is i went there for a political mission to get joe biden in trouble. ridiculous. >> focus on the violation of the constitution. >> reporter: biden has denied

discussing his son cease job overseas. >> he was protecting his son and intervened in a way that was corrupt, we need to get to the bottom of that. >> reporter: some in the administration suggested biden should be investigated, democrats argued if the claims against the president are proven, impeachment is the only option. >> if the president is withholding military aid at same time trying to brow be a foreign leader to provide dirt during his opponent during a campaign, that may be the only remedy that is coequal to the evil that conduct represents. >> ukraine says no pressure was put on its president. he is expected to meet with trump later this week during the u.n. general assembly. >> nicole, this week congress will also hear from the acting director of national intelligence about the whistleblower complaint that's at the center of all of this. what can we expect from all of that? >> nancy pelosi expects the

acting director not only to during over the complaint but to speak.is whistlebler t so far, she has resisted calls for impeachment, but did warn of a whole new stage of investigation if the administration does not comply. >> nicole, thank you. now to escalating tensions in the middle east. today iran's president called on western nations to, quote, stay away from the persian gulf. at the same time, the sparring goes on including threats of an all-out war over who is responsible for last week's attack on oil facilities in saudi arabia. ian lee is in riyadh. >> reporter: what started out as an attack on two saudi oil facilities leaving twisted metal and burnt out fuel tanks has turned into a war of words. iran's president said today the u.s. is creating an arms race in the region. while iran's foreign minister told face the nation it could lead to conflict. >> i'm not confident we can avoid a war.

i'm confident we will not start one. reporter:retary of state mike pompeo shotback. >> iran's foreign minister reated dend any part played by iran in this attack. will the u.s. release evidence that proves he's lying? >> well, we already have. there's ample evidence that demonstrates he's lied. the saudis showing systems built and manufactured inside of iran. >> reporter: this week saudi arabia showed us what they said is the evidence tehran was behind the attack despite the rebels claiming responsibility. the blast marks on the refineries point north. you can see five of these towers and when you look at the damage done, you can see that it's pointing in the northwesterly direction. that's likely where the projectiles came from. officials claim the pieces of drones recovered were made in iran. but a team of u.n. investigators is in the country independently

inspecting saudi arabia's claims. tonight the tensions are still high. united states says the additional troops are taking a defensive posture, but iran continue to warn that any strike against the country will see swift and broad retaliation. >> ian lee, thank you. now on the road to 2020. a new poll of likely democratic voters in the iowa caucus shows a change at the top, at least for now. the des moines register poll shows elizabeth warren leading joe biden by 2 points. bernie sanders is a distant third. ed o'keefe is onthe campaign trail in waterloo, iowa. how is the new poll playing among the campaigns? >> reporter: well, this is the first significant lead change. the fact that biden has slipped to second is notable. he has universal name recognition, but you talk to people in the state and they credit warren and her team for building out an operation that

is increasing her support. we shouldn't put too much into polls this early in the cycle, but the polling done by the des moines register through the years is often the one that ends up predicting the winner, which is why this poll gets extra attention. >> that's a good point. the polls a shows that just 1 in 5 iowa voters say they made up their mind about who to support. is that what you're hearing? >> reporter: it is. take the example of a woman we met earlier today who said she would love to see elizabeth warren and pete buttigieg end up on the ticket together, but she's a fan of amy klobuchar. and she's okay with biden too. indecisive voters have 134 days to decide. >> ed o'keefe, thank you. here in new york, a landmark on cle place tomorrow. yesterday teen activist of sweden who has mobilized d ceiv

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welcome back to the "cbs overnight news." the food and drug administration opened a criminal investigation into the recent rash of vaping-related illnesses. at least eight deaths are now blamed on e-cigarettes, the latest was in missouri. we have been following the story and brungs us up to speed. >> the cdc reports at least 530 confirmed and probable cases. most of them involve vaping with thc. that's the psychoactive ingredient in marijuana or both thc and nicotine. a bipartisan group in congress is working with parents to keep teens away from all e-cigarettes

while accusing the vaping industry of marketing to kids. >> it's frankly unfortunate that it takes so many people to get sick and.net across this country before we pay the kind of attention we should. >> reporter: lawmakers are joining parent who is say they can no longer kit zit back and watch as children fall to the dangers of e-cigarettes. >> we will not allow our children to be used as human getny pigs. >> they are calling for a legislative fix. like the trump administration, they say flavors marketed to teens is part of the problem. >> flavors like bubble gaum, gummy bear have no place in the marketplace when they are marketed to kids. >> reporter: 2018 data shows that more than 20% of high school students used e-cigarettes, up 78% from 2017. and nearly 70% of those students use flavored e-cigarettes. >> a ju, l represent came to my school and told me and my

friends, it was totally safe. >> reporter: the fda issued a warning to ju, l for their marketing practices including claims made in presentations at school. the carcinogens could have devastatie ining impacts on tee whose lungs are still developing. >> they told us and had we brought her in later she would have been unresponsive on a ventilator. we don't know if there will be permanent lung damage. >> reporter: a teen advocate. >> some of my friends are trying to quit because of the new data that has come out, but it's too hard to do without help. >> reporter: even before this outbreak, e-cigarettes divided the medical community. the american lung association says bluntly e-cigarettes are not safe. but the american cancer society says they are significantly less harmful for adults than smoking

regular cigarettes. another complication showed 5 million children use e-cigarettes. we wanted to see the seens for ourselves. >> one of the web's most talked about pro-vaping videos is an experiment comparing the effects of tobacco cigarettes and e-cigarettes on the lungs. >> this is cigarette smoke. >> put out by england's top public health agency. >> my research shows that e-cigarettes are significantly less harmful than cigarettes. >> reporter: it describes e-cigarettes as at least 95% less harmful than tobacco cigarettes but is that really true? >> i would agree with that and i would go further. i think there's now evidence from looking at the kacancer biomarkers it could be as high as 98 or 99% for cancer. >> reporter: david a brams is a professor at new york university. we asked his colleague s s to

recreate the expt healtengland. >> this is going to look very yucky and that's what's going to simulate what goes in the lungs of people. >> let's see what happens. >> reporter: for two hours shs the team simulated smoking four packs of cigarettes. comparing it to the same amount of vaping. in the end, the differences were plain to see. >> this is tar. >> yes. >> the damage caused by cigarette smoke was obvious. >> this is only four packs of cigarettes. >> this much material is entering their mouth and entering the lungs. >> just nasty. >> reporter: the vapor from a coffee-flavored e-liquid not so much. >> there's a little dampness. it smells like coffee. >> public health england is saying less harmful.

you think that's true or not? >> i think that's fairly accurate statement. they are much safer than cigarettes. >> reporter: but other american scientists are drawing very different conclusions. >> i would say it's 95% harmful because in any single study that i have seen that's look at this in a meaningful way outside the lung, they are finding damage and harm. >> reporter: inside this lab at west virginia university, he investigates the potential long-term effects of vaping not on the lungs, but on the heart. his team is exposing ro didn'ts to e-cigarette vapor. in a recent study, he looked at eight months of exposure, the equivalent of 25 human years. and what he found concerns him. >> the machine is detecting a higher velocity of flow through the vessels. >> reporter: the arteries stiffened, almost as much as

those exposed to cigarette smoke over the same time. >> stiffer arteries means greater risk for stroke, heart attack, aneurysms, any number of vascular effects. >> it's alarming. >> it's extremely alarming because it tell mess e-cigarettes are not going to be safer than cigarettes. >> reporter: he's trying to figure out why it happens. it's not the nicotine. >> it's something in the base solution. the base solution is made up of oils. >> but advocates say it's just a little oil and water vapor. that's it. >> that's actually the biggest lie about e-cigarettes is that it's water vapor. that's an oil and petroleum solution. >> when you think about the continuum of risk, you have pure air over here, healthiest thing on the planet and you have cigarettes over here, one of the most deadly things ever invented. where's an e-cigarette on that skail? >> it's just as close to

cigarettes as you can possibly get. >> the cdc is now advising people worried about health risks to avoid vaping, but at the same time, anyone using e-cigarettes to quit smoking should not go back to cigarettes. may 2020 is the official deadline for e-cigarette manufacturers to demonstrate that they are a net good for public health. the "cbs overnight news" will be right back. i saved hundreds when i switched my car insurance to geico. this is how it made me feel. it was like that feeling when you pull your green sock out of the dryer and then the very next sock is the other green one. and then you pull out two blue ones. and you keep going till you've matched every single sock in perfect order. and the owner of the laundromat is so impressed, he hangs a picture of you next to the dryer.

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okay, this is getting a little weird. we all go, why not enjoy the go with charmin? as the race for the white house heats up, the presidential candidates are looking for ways to kelkt with voters such as posing for selfies. here's the story. >> reporter: the most popular element of the campaign trail isn't necessarily a policy woters to a stump speech, l connect with candidates putting a new spin on retail politics. some of the the fphotos don't always technically fit the definition of a selfie, but here's the snapshot of the modern campaign. >> reporter: they came -- >> hello, new york. >> reporter: they saw. >> thank you, thank you.

>> reporter: they selfied. in the race for the white house, so-called selfie lines have become a key feature of campaign events with voters willing to wait hours to take a photo with the candidate. >> we waited this if loin and it was worth it part sglm cap pains have professionalized the pi picture taking experience and made it central to their digital strategy. >> the real measure of democracy more than 50,000 selfies. photo lines are such a priority for elizabeth warren's campaign that she even changes into sneakers to prepare. >> i was really going to build a grass roots movement. small dollar donations, volunteers and selfie lines. >> reporter: warren's selfie line is a fine tuned operation. >> there's a person in every task. somebody to take the phone from you, hand it off to the person that takes the picture of you while you're with liz. >> reporter: a picture is worth a thousand words. but for these campaigns, they are actually worth a thousand

impressions. fphoto lines act as a mass marketing tool. a photo taken is a photo shared serves as free digital advertising for candidates. >> we live in a world of social media. anybody who gets a selfie of you will post it online. their friends will see that as well and helps to generate vorlty. >> it's major savings for the campaigns. all while generating grass roots momentum. >> are you going to share this photo? >> everywhere. >> the selfie lines have become such a key feature of the campaign events the candidates build in extra time to make sure they can take a picture with everybody who comes to see them. >> thauk. >> it's one of the most important and meaningful interactions that i have at any of these events. >> my team members are usually with me. we have to follow up with this person. >> reporter: some candidates have developed their own selfie protocol. >> first thing you have to know

how to hack into any phone. they put the code in and take a lock time. by taking it myself, i can swipe with one finger and be in their camera. >> joe biden is known tohis own emional connections. >> people want to be rele ask y questions. they are frightened about their circumstance or suffering a serious loss. >> any instance in that line that you felt that you really sympathetic with someone? >> more than one. what do you say to a woman who says i lost my child, and if we had decent health care, that would not have been the case. it moves you to the core. >> reporter: the selfie lines influence policy proposals. >> is there a plan that was specifically directly influenced by your conversations on the selfie line? >> yes, in fact, i distinctly

remember meeting the woman in the selfie line who said, why don't you commit that your secretary of education will be someone who will talk in public schools. and i thought about that. and i thought, you're on. >> reporter: sometimes they even bring competitors together as friends. >> elizabeth warren held a four-hour long selfie line earlier this week. they are now up to 60,000 selfies showing no signs of slowing down any time soon. in fact, our own ed o'keefe spotted the senator at the airport this week on their way to iowa. and look what we have here. a selfie line impromptu forming at airport. this is something that we're going to continue to see for a long time.

when you humble yourself under the mighty hand of god, in due time he will exalt you. hi, i'm joel osteen. i'm excited about being with you every week. i hope you'll tune in. you'll be inspired, you'll be encouraged. i'm looking forward to seeing you right here. you are fully loaded and completely equipped for the race that's been designed for you.

a new study in the journal science takes a look at the mysterious disappearance of billions of birds in the skpus cana canada. more than a quarter of the population disappeared over the last half century. jonathan vigliotti asked some of these scientists why this is happening. >> how accurate are these numbers? >> extremely accurate. >> reporter: the bird population dropped by 3 billion in just 50 years. the alarming die off outlined in a new paper. peter mara, author and director

of the environmental initiative, called it an environmental crisis. >> this needs to be a wakeup all. it's time people did wake up and started taking care of their environment like we need to do. it's an environment we also depend on. >> reporter: the study brought together information gathered since 1970. much of it collected by thousands thousands of bird enthusiasts from across the u.s. and canada. hardest hit grassland birds like spar rows losing more than half their population. and shore birds seen in coastal regions, where population has fallen by more than a third. researchers aren't sure what's making birds so vulnerable, but point to humans for potential reasons of the destruction of natural habitat and use of toxic pesticides. >> when we lose them, it's like burning. it's tearing down our museum. we're losing our heritage. future generations will not be able to share watching these big flocks of birds that we once

watched. >> it tells us we're a little sick. we need to get back on the mend. >> reporter: the director of the aud bonn center for wildlife minutes from downtown los angeles. >> birds are important because they tell us a story about our environment. just based off the birds that you see present in the community. the canary in the coal mine. >> it's a sign sth conseation efforts on a legislative level has to happen now. >> i t think of these birds as e randts, the monets, they are the priceless pieces of art that exist in nature. >> reporter: pieces of art that he hopes can be enjoyed for generations to come. cbs news, los angeles. >> that's the "cbs overnight news" for this monday. for some of you the news continue, for others, check back for "cbs this morning."

on t broadcast cenr in new york city, i'm adriana diaz. captioning funded by cbs it's monday, september 23rd, 2019. this is the "cbs morning news." president trump admits he spoke to the ukrainian president but insists he didn't pressure him to investigate joe biden's son. >> that was not pressure. i know when i give pressure, and that was not pressure. >> we'll break down this whistleblower controversy that has some house democrats renewing calls for impeachment. a shakeup on the campaign trail. elizabeth warren surges in a new poll to take the lead in iowa for the first time. what iowa experts think is behind her rise to the top. plus, the red carpet turned purple for televis