BBC Generation Earth

= Greetings From Jenish =-

This is our home.

From this height looks still there just like thousands of years ago.

But a little closer you will see that we some things have changed.

We have our world on redesigning.

Three, two, one.

Wherever you look ...

Do not look down.

You can see the scale ... of this gigantic transformation.

Our generation will change the appearance of the earth as never before.

I'm Dallas Campbell and I'm going to show ...

how we shape the modern world.

We build faster than ever ...

and change in an instant entire landscapes.

Some jobs at my house last longer ...

than Shanghai does about building of an entire city.

We open the earth ...

and conquer the skies while we have a home of it.

Squeeze jij'm ever? Sometimes a bit?

I go along with people making the impossible possible.

This is one of the most dangerous jobs in the world.

Someone has a horse discarded. This sort of thing can be found in the sewer.

Thank you. - You're my hero.

Our world begins a human made world.

A PLACE TO LIVE

Here we are.

Higher than this, you can not climb on a man-made object.

I stand at over 800 meters Top Dubai ...

the world's tallest building.

A generation ago, a building if it is unthinkable ...

but it shows which we are now capable of.

We build artificial mountain ranges ...

which is beyond the rim extend.

The story behind the curb of these heights began long ago.

Close to home.

THE HIGHEST BUILDING WORLD

For thousands of years we like the height.

Once stood here in Britain even the world's tallest building.

In the Middle Ages ...

was the Lincoln Cathedral the world's tallest building.

He broke the record of the pyramid Cheops had owned. Almost 4000 years

But the pyramid is almost solid ...

and designed as a mausoleum for a person.

This building has been designed for worship with thousands of people.

In order to be able to construct, so high, there was an architectural breakthrough needed.

If you want to build a building that high and a roomy interior has ...

that people can use for large gatherings ...

then you must be very good start thinking about you. construction techniques

The medieval builders had overcome gravity.

And to see how they have done, I do too.

Beautiful, man.

The architects used as little as possible stone ...

but just enough to prop up the building.

Imagine what forces are working on this building.

All those segments which to lean against each other ...

and create a perfect balance.

And from here you can see how it all works.

A network of countless arches, vaults and pillars holding up the building.

They form a stone skeleton for the cathedral.

The spread ribgewelven the weight of all the stone.

The pointed arches carry the weight downwards through the pillars.

The tower of the Cathedral gives his height ...

, only supported by four large pillars.

Nearly seven hundred years later, this huge building still standing tall.

When the cathedral's tallest building was in the world, he was even higher.

The cathedral is 80 meters high. And it's beautiful.

But what is even more spectacular, is that he was much higher even ever.

The height of a church was then symbol of nearness to God ...

So they kept going.

There were three huge spiers built on top of the towers of the cathedral.

The largest was 80 feet high and doubled the height of the building.

The pricked remained more than two centuries stand before she collapsed in a storm.

The focus was the cathedral Lincoln 14 meters higher ...

than the pyramid of Cheops.

In order to be able to build even higher was needed a new building material:

Steel.

Technical progress ...

The Eiffel Tower was almost twice as high as the Lincoln Cathedral.

The Chrysler Building from 1930 ...

was the first tallest building world with a steel skeleton.

Just one year later ...

could the Empire State Building even higher thanks to a new construction technique.

The next big breakthrough came in 1972 ...

with the slim and very high World Trade Center in New York ...

and shortly thereafter with the even higher Sears Tower in Chicago.

The steel frame mounted on a glass walls made the building much lighter.

The Petronas Towers in Kuala Lumpur used steel and glass ...

on a concrete frame around a core of reinforced concrete.

This yielded the core strength and the shape.

Skyscrapers did now no longer to be rectangular.

It had become works of art.

The Taipei 101 was the first building that reached a height of 500 meters.

You would think that the stretch from there it was.

THE NEW World's tallest building

This is the desert of Dubai.

In this arid landscape is the world's first mega tower risen.

And he has a new record.

I stand in the shade a unique building.

It is about 2.5 km away ...

and is over 800 meters high.

With its 829 meters let each other building on earth in the not sink.

It's really ridiculous. It's nowhere quite like it.

The designers had no example ...

when she first mega tower built in the world.

What they thought, was not always as high-tech as you might think.

If you remove the glass, clear he is upheld ...

old-fashioned, brute force 330,000 cubic meters of concrete.

The Burj Khalifah has a skeleton entirely of reinforced concrete is made.

During construction, liquid concrete in ice packed, so it would not harden.

Subsequently, the 600 meter pumped up.

Before the press was needed of up to 200 atmospheres.

He suggested the record for the highest building less than 320 meters sharper.

This corresponds with an additional Eiffel Tower.

In order to keep the tower playing alongside brute force ...

clever aerodynamics also play a role.

Welcome to the Burj Khalifah. - Thank you for seeing me.

To understand this, I go to a place where few people are allowed.

This is the last one. - Thank you.

I am very nervous.

Dallas, can you come here? - Yes.

Step in only. I check it here.

I was hoping that there is too much wind would stand and that it would not go through.

And that the windows were clean itself. - Unfortunately not.

I knijp'm worse than ever. - Oh yeah?

We are pretty high here, you know.

Everything okay? - Yes. Not too tight around the legs, huh?

Is everything okay? Another one here.

And you are ... - Ready to go wild.

Getting Started. - After you.

This is Chris Enlau. - Pleasant.

Bobby Carter. - Pleasant.

And Davey. - Pleasant.

Shariq and Krishna. - Pleasant. I'm going to do my best.

I walk along today with the team that the outside ...

from the top windows the world to clean.

But just sit back. You really can not.

We need the bucket.

A dry mouth. Squeeze jij'm ever? Sometimes a bit?

I have not looked down.

Now you do.

It is almost inconceivable what extent are these windows.

I'm 60 meters over the next terrace ...

that is 600 meters is above the earth.

This is higher than the previous world's tallest building.

If I drop something from here can cause serious damage.

In such a tall building play a lot of factors involved.

One of these is the force of gravity, I feel now.

Gravity is predictable and is a way.

You should worry more about the wind, because it is unpredictable ...

and can affect the building. And cleaners.

Tall buildings are not in danger to knock to blow ...

but to be. sucked down

Around tall buildings , small whirlwinds arise.

These are low-pressure areas pulling to the building.

If there are enough of these combine ...

they tower bring to shake.

That this does not happen the Burj Khalifah ...

is due to the smart, aerodynamic design.

Through the building tapered to run and angles and curves add ...

breaks the building and the wind can whirlwinds not combine.

This "confuse the wind '...

According to the architects the only way to build as high.

It strikes me that even such a sophisticated building ...

still the best can make cleaning ...

by a man with a wiper and a bucket.

It takes three months to wash. 24,000 all windows

And when they're done, the team start all over again.

If you build such a work, it should also look beautiful.

And it should continue to look beautiful. - Indeed.

I hope you enjoyed it. Go on. Good.

That was intense, say. I do not how to do this. every day

It was intense, but great.

The world's tallest building shows how ambitious we are.

This fishing village in Dubai is transformed ...

a metropolis with more than two million inhabitants.

In just thirty years, there are over 150 skyscrapers from the sand risen.

The mighty Burj Khalifah is a beacon ...

the attention of the world draws on this city in the desert.

A generation ago, he had can be. still not built

The sheer scale of our redesign the earth is particularly noticeable in cities.

There are now almost as many people in cities ...

if lived in 1970 in the world.

And in 2008 we achieved an important turning point.

For the first time in history, more than half of us in cities.

We have over four million km2 paved surface.

To understand what that means ...

you have to even imagine all cities that lie next to each other.

A forest of skyscrapers would extend further than you can watch.

London will be located. Alongside New York

Alongside Tokyo and Paris.

A large, sprawling super city.

The strange thing is: If you all urban areas would lay next to each other ...

would that monster metropolis only a cover percent of the earth's surface.

More than half of our so live together ...

on a surface that fits easily on an island half as root as Australia.

Or one that is 187 times as root as Wales. The country, not the mammal.

It is a challenge to many people in the cities to mountains.

Hong Kong is one of the most populous cities in the world.

HONGKONG 7.6 MILLION PEOPLE

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