At just 16 years old, our next guest

is already changing the world.

Look at her.

Humanity is now standing at a crossroads.

We must now decide which path we want to take.

[MUSIC PLAYING]

A teenager from Sweden, called the Voice of the Planet,

leads a global youth movement and has been nominated

for the Nobel Peace Prize.

We are in the midst of the sixth mass extinction.

Our house is falling apart.

Our leaders need to start acting accordingly.

Her actions started with a solitary strike

outside Sweden's Parliament last year.

And now, look at what her movement has become.

Students and workers all around the world

are flooding the streets demanding action

on climate change.

1.4 million kids across dozens of countries

joined her in the streets.

But it's looking like this could be the largest climate protest

in our planet's history.

Now, she's taking her message to the other side of the Atlantic.

Greta Thunberg has completed her sailboat trip

to attend a United Nations Global Warming Conference.

Thunberg refused to fly here because of the carbon footprint

of traveling by plane.

You all come to us young people for hope.

How dare you?

You have stolen my dreams and my childhood

with your empty words.

Greta Thunberg is taking on climate change

head on, pulling no punches.

She delivered a scathing speech.

She fiercely criticized leaders for their inaction

on combating climate change.

You are failing us.

But the young people are starting

to understand your betrayal.

By scolding the rich and powerful,

she made such waves, a prominent conservative in Britain

tweeted, "Freak yachting accidents do happen in August."

And now she's on the president's radar, as well.

Overnight, the president seeming to mock this teenage activist

with a sarcastic tweet.

And if you belong to that small group of people

who feel threatened by us, then we

have some very bad news for you.

[CHEERING]

Because this is only the beginning.

Please welcome Greta Thunberg.

(SINGING) We can be heroes just for one day.

[CHEERING]

[MUSIC - DAVIE BOWIE, "HEROES"]

First of all, thank you.

I guess, everyone who meets you says, thank you.

Because what you're doing, it's the loudest voice.

And it's getting so much attention.

And we need this, because we haven't, obviously, done

enough.

So I want to start with thank you.

And then does this just get overwhelming?

Because you're just doing so much at your age.

This is a lot of energy.

Yes.

It is a lot.

It is a lot to take in.

It is a lot for a teenager.

Yeah.

It's a lot.

And you're traveling around the world.

And you're speaking in front of so many people.

We've been trying to get you for two months.

It took you to get-- you know, you had to take a boat.

And then you were in New York.

And then you had to take a train.

And so it took a while to get you here.

But thank you for being here.

[CHEERING]

Thank you very much for having me.

So, I mean, I, like so many people,

are fascinated that you started learning about climate change

at what age?

I think it was age 7, 8, 9 in school.

I learned the basics, like the planet was warming because

of increased greenhouse gases.

And then I just couldn't believe it.

Because I thought if this was really true,

then surely someone must have done something,

then surely we would take it seriously.

But no one took it seriously.

And so I started to read about it.

And, of course, the more I read about it,

the more I understood.

And once I fully understood it, I couldn't just

look away anymore.

Right.

But there's a lot of people.

You could say that for a lot of young people and adults.

But people just get on with their lives.

And they don't go after it the way you have.

And you started with one small gesture.

You just sat down on the street and put a sign out.

And now, over 11 million people, because of you,

have been striking because of this.

[CHEERING]

11 million people.

I mean, I guess it shows you what one voice can do, right?

It shows you the power that you have.

Yes.

It really does.

And I would never have expected that something like that

would happen.

I mean, I just thought that I need to do whatever I can do.

And it's, obviously, not going to be enough.

But at least it's something.

And I needed to, just for myself,

make sure that I did whatever I could,

so that I could look myself in the eye in this crisis.

Well, it's the way you speak, I think.

It's where you're coming from.

It's how you come across, and your energy.

And you're so real and raw.

And I think that's probably why.

We're going to take a break.

And we're going to talk about what everyone else can do,

so they can look themselves in the eye.

And we can all try to turn this thing around,

because we're running out of time.

So we'll be right back.

You, obviously, have a lot of supporters.

You have a lot of people who are walking and fighting with you.

But then you get a tweet from the president, who basically,

was not a kind tweet.

Do you ever think about-- would you

sit down with him to try to help him understand climate change?

I don't understand why I would do that.

[LAUGHTER]

[CHEERING]

I don't see what I could tell him

that he hasn't already heard.

Yeah.

And I just think it would be a waste of time, really.

Yeah.

And you have said--

and I love that you say this.

You say that your Aspergers is a gift.

You look at it as a gift.

And I think it is a gift.

But explain why you say that.

I mean, in this society, everyone is the same.

Everyone thinks the same.

And then I think it is a gift to be different,

to have some kind of--

if you are on the autism spectrum,

that makes you different.

And especially in a crisis like this,

we need to think outside the box.

We need people who think differently.

And that means that people who work differently

can be a good resource for that.

Yeah.

[CHEERING]

What have you done?

What have you done to change your life?

Like you said, you do things that you

can do to look yourself in the eye

and know you've done enough.

What have you done?

I have done--

I have stopped flying.

And I have gone vegan.

I have a shop-stop.

It means you don't buy new things unless you absolutely

have to and just things like that.

But especially, I'm trying to communicate what is happening

and try to put pressure on people in power.

All right.

So--

[APPLAUSE]

--here's what we're doing.

We're going to do something, because your voice is--

I just have been wanting to meet you for so long.

I think you're so amazing.

So we're creating a section on Ellentube.

And we're dedicating it to you.

So we'll have information and resources

to help educate people on climate change.

You can learn how to reduce your carbon footprint,

see what you can do to make a difference.

We'll also have information on how to join Greta's climate

strikes.

As she posts new information, we'll share it on that page.

We're committing $100,000 into promoting that web page to help

your message get across.

[CHEERING]

Thank you.

All right?

Thank you.

And Greta's book No One Is Too Small to Make a Difference

is out now.

And you're all going to go home with a copy.

We'll be right back.

[CHEERING]