Tom: Hey guys,I am here in Mexico City, the capital of Mexico, and today we have a story that is kind of a downer — literally. We will explain later in the show. I am Tom Hanson, and Channel One News starts right now.

Keith: We will check back in with Tom later in the show, but first, last night was one of the biggest in American politics as presidential hopefuls Donald Trump and Hillary Clinton squared off onstage for this year's first presidential debate, and Azia was watching every minute of it.

Azia: Yeah,Keith, it was lit with nearly as many viewers as the Super Bowl as both candidates fired shots at each other.

Donald Trump and Hillary Clinton started off by shaking hands at the first presidential debate, but the fireworks started immediatelywhen they were both asked about the economy.

Hillary Clinton: It would be the most extreme version — the biggest tax cuts for the top percents of the people in this country that we've ever had.

Donald Trump: For 30 years you've been doing it, and now you're just starting to think of solutions. I will bring — excuse me — I will bring back jobs.

Azia: Trump took aim at Hillary's emailsand the use of a private personal server while she was secretary of state. And Clinton took aim at his refusal to release his taxes.

Trump: When she releases her 33,000 emails that have been deleted — as soon as she releases them, I will release — I will release my tax returns.

Clinton: It must be something really important, even terrible, that he's trying to hide.

Azia: At timesthe attacks even got personal.

Trump: You know, you’ve seen me. I've been all over the place.You decided to stay home, and that’s okay.

Clinton: I think Donald just criticized me for preparing for this debate.And, yes, I did. I prepared to be president, and I think that is a good thing.

Trump: I said she doesn’t have the stamina, and I don’t believe she does have the stamina. To be president of this country, you need tremendous stamina.

Clinton: As soon as hetravels to 112 countries and negotiates a peace deal, a cease-fire,a release of dissidents, an opening of new opportunities in nations around the world or even spends 11 hours testifying in front of a congressional committee, he can talk to me about stamina.

Azia: There was a moment of agreement. Both said they wanted to restrict gun purchases for people who are not allowed to fly for national security reasons.

Round 2 takes place on October 9.

Keith: Thanks,Azia. Now, let's see what our Team OneVote thought about the debate and how their favorite candidate matched up.

Alicia Huggins: I think my candidate,Donald Trump, did an amazing job at the debate and that he answered all the questions to his ability and defended all hisanswers the best that he could.

Kai Sherwin: I think Trump is actually coming out on top. He's resorted to some of his old antics by interrupting Hillary and by saying things that aren't entirely truthful.

Brooke Reaves: Trump almost lost his temper, but he reined it back in, which I think is good for him. I think that he should have provided more credible evidence, and I think that Hillary should have talked more about actual policy.

Elliot Smith: Donald Trump took the bait that Hillary Clinton offered him far too much and sometimes went off message.

Simone Chaddha: I know that Donald Trump called America a third-world country. I don't really agree with that. And I know that Hillary Clinton has, like, that email scandal, but at the end of the day,I'm still for Hillary Clinton.

Genny Jackson: Oh, my goodness. This is the craziest thing. I think Hillary Clinton is definitely doing a great job. I think Donald Trump is being just so ignorant and rude and disrespectful of what we as Americans believe and what Hillary Clinton believes.

Keith: Now we want to know what you guys think. Who did better, Hillary Clinton or Donald Trump, and why? Head over to ChannelOne.com to weigh in, and make sure you leave a comment.

After the break, teens and police work on change by changing roles for a day.

Keith: There have been a lot of headlines lately about young people clashing with cops over things like police brutality. But what if they could trade places for a while and see things from a different perspective? Well, that is what one program in Chicago is trying to do. Check it out.

Teen playing cop: We just need you guys to clear out the area.

Cops playing teens: For what? Why?

Teen playing cop: We got a few noise complaints.

Keith: The adults in blue shirts are actually police, but on this day, they pretended to be teenagers.

Police and teens: Get that camera out of my face. What, what's the problem?

Keith: And these teens pretended to be police.Backup arrives after one officer draws his weapon. This role-playing exercise was used at a high school assembly run by the Chicago chapter of the National Organization of Black Law Enforcement Executives.The goal is for students and police to learn from each other.

Rodney Jackson: It was very helpful and to actually get that experience and that perspective.

Keith: Seniors Rodney Jackson, Kiara Jefferson, Latrice Williams and Ayo Taiwo thought it was a great idea.

Teen: I loved the role-playing. It's like they showed us their everyday life in little scenes.

Rodney: You have your own perception of it, but then once you get that other perception, you kinda see how it plays hand in hand and what it’s like. To have a phone this close to your face while you're trying to talk to somebody is not your ideal way to handle it.

Keith: South Holland Police Chief Gregory Baker says he became an officer after afriend was shot by police.

Chief Gregory Baker: We protect, we serve, but the part that's not mentioned a lot is we care. Ninety-nine percent of the police officers who are out here got into this job because they care about people. And that's what it's all about.

Keith: Chicago police officer Caeana Sanders agrees.

Caeana Sanders: Everyone is not against the police, just like the police are not all against the community. People really do still want that partnership. They want to feel safe.

Ayo Taiwo: Change has to start somewhere, and I think this is a good place to start.

Keith: With a conversation to avoid confrontation.

Very cool.

Okay, coming up, Tom Hanson heads south, where one city has got a sinking situation.

Keith: Today we find Tom Hanson in the most populated city in the Western Hemisphere.Mexico City has a lot of people, over 20 million to be exact, and all those people need plenty of water.But all that demand is causing a lot of water woes, one of which is causing the city to go under — literally.

Tom: Mexico City, one of the most populated cities in the world — known for art, history and its vibrant culture. Oh yeah,and one other unsettling thing: sinking into the ground.

If Mexico City is sinking, some might think that, eventually, it is just going to fall into the earth. Is that possible?

Peter Deming: No, it is collapsing, but the particles of clay are closer together, which increases their strength, so we’re not gonna lose Mexico City.

Tom: It is a problem for many cities across the globe, but compared to other places, this city is in a free fall.Studies show Mexico City is actually sinking about 32.8 feet over the last six decades, leading to crazy cracks and slanted streets…

Just one example of the sinking is this bench. It looks like it is virtually cracked in half.

…forcing the city to adjust to a landscape that is constantly changing.

We are at a popular monument in the heart of Mexico City. And where I am right now, this used to be street level. But because of all the sinking around the monument, these steps had to be built. The city spends billions of dollars to keep things running, all for a problem that began centuries ago.

It may be hard to imagine now, but the sprawling concrete jungle of Mexico City was once a large lake. The Aztecs built a massive civilization calledTenochtitlan, which thrived until the Spanish Conquest. But in 1521 the Spanish destroyed the Aztec capital and built Mexico City.

In order to do so, the Spaniards decided to drain the giant lake. All that remains now is a vast aquifer located beneath the ground, which Mexico City uses for the majority of its water supply. But as the population continues expanding, the demand for water has increased, and the natural reserves beneath the city are being drained faster than they are being refilled, causing the ground to collapse.

Deming: In 1900 the city was settling at a rate of 1 inch per year. So the ground would go down 1 inch every year, and in 1940 the settlement had gone from 1 inch to 6 inches per year.

Tom: Over time the city got heavier and heavier, and it started to sink.

Deming: Well, they built buildings on top of the fill, which adds weight. But all of that weight — the fill, the buildings — it is compressing the clay.

Tom: And that is causing the city to sink.

Deming: Yes. The clay is compressing.

Tom: And for a city spanning 25 miles east to west and almost 40 miles north to south, solving this problem isn't going to be easy.

Mexico City has millions of people, though, and it is such a sprawling city. Is there any way to solve this problem once and for all?

Deming: No, you’ll always have different ages of buildings, different weights. It’s a maintenance issue.

Tom: Putting a Band-Aid on the eroding streets and architecture, but not necessarily getting to the root of the issue, conserving Mexico's water supply.

Deming: It will restore with time, if they stop pumping, and that will freeze things where they are.

Tom: Tom Hanson, Channel One News.

Keith: Well, that is going to do it for us today. We will see you right back here tomorrow.

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