They're world class athletes, and they also are world class forest ecology scientists.

The 20 largest cities in the world.

London is among the largest cities in the world.

It's one of the largest cities in the world.

Shanghai is among the largest cities in the world.

I am interested in old cities in the world.

And now, out of typically 46 cities, 33 of those mega cities are in the developing world.

This is what makes cities (Applause) this is what makes cities so green in the developing world.

London is one of the largest cities in the world.

London is one of the largest cities in the world.

Tokyo is one of the largest cities in the world.

Paris is one of the largest cities in the world.

New York is among the largest cities in the world.

So world class entrepreneurs are never lucky. Never.

World class entrepreneurs do that over time consistently.

So different cities around the world treat their waste water differently.

And also in 50 other cities around the world, people participated.

We have a world class gallery because we believe that poor kids need a world class gallery, so I designed this thing.

We are moving to cities. We are moving up in the world.

Education is more possible in the cities, and that changes the world.

Speaking of Japan's toilets, shower toilets are world class technology.

As we're moving into cities, the world is also embracing a Western diet.

In the information world of the Internet, you find information about urban cities and small islands of the world.

Italian cities.

I ever went on to become a brilliant, world class neuropsychologist.

lots of different measures dense cities or dispersed cities,

They are what I consider to be the cities of tomorrow, the new urban world.

In multiple cities...

And cities specifically.

Low lying cities all around the world will disappear within the lifetime of children born today.

One must practice every day in order to become a world class athlete.

Coursera provides free access to world class education offered by the top universities.

Let people know that what we are doing in Birmingham is world class.

She is a world class soprano singer who studied in Rochester, New York.

There is absolutely no reason why poor people can't learn world class technology.

So it's like 3rd class, 2nd class, 1st class.

I dislike big cities.

Very few cities fail.

We've driven in cities,

Cities, past and future.

Some cities process it.

The circles represent cities.

Anyway, the American cities

That's what cities do.

But I did go on to be a reasonably astute, arguably world class worrier.