Original subtitles

We've had some hot days this summer

but nothing like what we're going to get into, starting tomorrow.

Today, the mercury hit a scorching 35 degrees Celsius.

Temperatures are set to rise even further this week and could even

break the all-time record.

Right now, we are facing our greatest threat

in thousands of years.

Climate change.

For a long time, climate change was something that scientists

were predicting that would happen in the future.

But that's no longer the case.

What we're doing right now is we're so rapidly changing

the climate, for the first time in the world's history,

people can see the impact of climate change.

Greater storms, greater floods, greater heat waves,

extreme sea level rises.

All of this is happening far faster than many of us thought possible.

Scientists across the globe are in no doubt that at the

current rate of warming, we risk a devastating future.

It's difficult to see how the population of the world

will actually feed itself.

It's happening in your world.

It's happening in my world.

Time is very short.

There's still time but there isn't much time left.

The science is now clear that urgent action is needed.

We're at a tipping point.

We can change history.

Right now!

What happens now, and in these next few years,

will profoundly affect the next few thousand years.

What can be done to avert disaster and ensure the survival

of our civilisations...

..and the natural world upon which we depend?

It's our future.

We can't just let it slip away from us.

Standing here in the English countryside, it may not seem obvious

but we are facing a man-made disaster on a global scale.

In the 20 years since I first started talking about the impact

of climate change on our world, conditions have changed far faster

than I ever imagined.

It may sound frightening, but the scientific evidence is

that if we have not taken dramatic action within the

next decade, we could face irreversible damage

to the natural world

and the collapse of our societies.

We're running out of time, but there is still hope.

I believe that if we better understand the threat we face,

the more likely it is that we can avoid such a catastrophic future.

Our climate is changing because of one simple fact.

Our world is getting hotter.

We have temperature records going back over 100 years.

There are dips and troughs.

There are so many years that are not as warm as other years.

But what we've seen is this steady and unremitting temperature trend.

20 of the warmest years on record have all occurred

in the last 22 years.

It's not just Met Office records that are showing this trend.

Data from the US Climate Centre, NOAA, the Japanese Met Office

and NASA all show the same sharp rise in temperatures.

When scientists first became concerned about these increasing

temperatures, nobody could be sure exactly what was driving them.

Four decades of research later, on land, at sea,

and in the far reaches of our atmosphere,

the evidence is now unequivocal.

What's striking is that warming trend cannot be explained

by natural factors...

but is caused by human activities.

In particular, by use of fossil fuels.

The problem is that everything we do, our entire economy,

from the moment you wake up in the morning and turn on the light,

or look at your cellphone, to the moment you go to bed

at night, and even then because your cellphone

is still drawing power at night, I mean, we're all using energy

all the time.

And in the industrialised world, that energy is almost

entirely fossil fuels.

When you burn fossil fuels, coal, gas and oil,

to power our energy generation, to heat our homes,

to drive our factories, to power our cars and our trains,

and travel around the world.

When we burn fossil fuels, it produces carbon dioxide

as a waste product.

Carbon dioxide acts like a blanket.

It absorbs the heat radiation from the Earth's surface

and that keeps the surface warmer than it would be otherwise.

The problem is what we're doing now is we're adding extra

carbon dioxide and other greenhouse gases.

So we're increasing the thickness of this blanket.

Before we started to burn coal, the amount of carbon dioxide

in the atmosphere was about 280 parts per million.

It's now over 400 parts per million.

And the planet gets warmer and warmer.

We have pumped so much carbon dioxide into our atmosphere

that our world is now around one degree Celsius hotter

than it was in pre-industrial times.

This warming is enough to bring about the raft of effects

we call climate change.

One degree Celsius global warming may not sound like much,

but it's having a dramatic effect on our weather.

You warm up the planet, of course you're going to get

more intense and more frequent heat waves.

You're going to dry out the soils.

You're going to get worse drought.

We're seeing extreme heat in southern Africa,

Japan, North America, in the UK as well.

It is officially the hottest day of the year so far.

Often, the question is, did climate change cause a certain event?

You can never really answer that question.

But what scientists do is to look at whether climate change

made a certain event more or less likely,

or more or less intense.

Last year, we had a heat wave that was actually the joint warmest

on record, alongside 1976.

And we have been analysing this here at the Met Office.

What that showed us was that the chances of that heat wave

had increased by about 30 times.

So it's now about 30 times more likely that we had that heat wave

than we would have had without climate change.

Today, the mercury hit a scorching 35 degrees Celsius.

So it doesn't mean to say that every single weather event

is due to climate change.

But what climate change does mean is that with the baseline climate

having changed, then the frequency of the

extreme temperatures is increasing.

And that has a substantial effect.

In November last year, when temperatures in Cairns, Australia,

hit 42 degrees, even creatures specifically adapted

to heat were unable to survive.

They're just...

everywhere.

When we got here in the morning, it was the first time

really we saw it.

There were just dead bats as far as the eye could see.

There was a deafening sound of babies crying.

You just don't know where to start.

So we just started finding babies, basically.

There's a little baby attached to its dead mum.

Like all species, flying foxes have ways of dealing

with the conditions of their environment.

But it seems their usual cooling methods are no longer enough

for the kind of temperatures Australia is now facing.

Last year, temperature records were broken across the country.

Scientists have shown that it's simply inconceivable that you would

see these temperatures without the fact of climate change.

We saved about 350.

The rest are dead.

Over 11,000 died from that colony.

And if you have two more events like we had,

the species is gone.

This is climate change in action.

We need to wake up.

I've seen for myself that in addition to the many other

threats they face, animals of all kinds are now

struggling to adapt to rapidly changing conditions.

Think of the equator.

As climate change occurs, that central part of the world

becomes increasingly uninhabitable.

If climate change is too fast, we're pushing them

off the planet, in effect.

We're causing extinction of species already.

And that's irreversible.

Scientists believe that 8% of species are now at threat

of extinction solely due to climate change.

This isn't just about losing wonders of nature.

With the loss of even the smallest organisms,

we destabilise and ultimately risk collapsing the world's ecosystems.

The networks that support the whole of life on Earth.

What's been happening in recent years is really showing us

what one degree Celsius really means.

Not just for wildlife, but for people, for their safety,

for their livelihoods and for their futures.

As temperatures rise, the threats we face multiply.

Last year saw record-breaking wildfires take hold

across the globe.

Firefighters are working around the clock.

It has to be seen to be believed.

Australia is seeing some of its worst fires in years.

We've seen wildfires break out in Greece,

even in the Arctic.

Wildfire, sweeping across some of the coldest countries on Earth.

We've seen a tripling in the extent of wildfire

in the western US, California.

The fires that swept through California last year

caused $24 billion worth of damage.

106 people lost their lives.

We're not just talking about an inconvenience.

We're talking about people's lives,

their livelihoods and their communities being damaged.

The wildfires need an ignition source.

What?

Maybe cigarette butts, or lightning, and then you need

the weather conditions that are conducive to that fire spreading.

GASPS

Do I go?

I don't want to get trapped.

Research has shown that the chances of having these very hot,

dry conditions has increased as a result of climate change.

Easy, easy. Oh, my God!

Easy, easy.

Dad, this isn't safe.

It was a dead end road, so we knew it was our only option

to drive forward.

And all sides of the road just completely

engulfed in flames.

The car is heating up. It's going to explode!

All right.

He's going, "Dad, Dad, we're going to die!"

And I said, "No, we're going to be fine, you know."

Jesus, God help us.

I stayed calm.

I think being a father, you're trying to keep

your son calm too at that point.

We're good, we're good, we're good.

We could hear trees literally exploding.

Falling all around us.

Please, God, help us.

A large branch went right over the top of the car.

The whole top of the roof was burning and we didn't realise it.

There was a tree down.

We can't get out!

That was the moment when I really thought

that we might die.

Oh, my gosh! Stop! Stop!

Let's get out of here.

I decided to put the car in reverse.

I had to drive backwards through everything we had already passed

through to the lakeshore.

This one little boat was down there watching the fire.

And we were able to wave them in to help us get out of there.

That, to me, was just a miracle.

But it's not just through extreme heat events

that climate change is having an effect.

It's changing our weather systems in other ways.

This is a basic result of physics.

With a degree Celsius of warming, there's more moisture evaporating

off the oceans.

When there's more moisture in the air,

you're going to get more rainfall.

You're going to get super storms and force flooding events.

We are seeing the impacts of climate change now play out in real time.

They're no longer subtle.

You have had the worst rain in China, in Japan.

You have had a deluge in Kerala.

The crisis deepens for hundreds of thousands in Kerala.

Whilst they can't all be attributed to climate change,

last year's extreme weather events meant that millions of people

needed humanitarian aid.

Join the dots. It's happening.

It's happening in your world, it's happening in my world.

And let's be very clear about this - it is going to get much worse.

Climate change goes far beyond the weather.

Thousands of miles away and out of sight of most of us,

another threat is building.

Earth's ice, frozen for millennia, is melting.

Earth's temperature has risen by what most people would think

is a small amount over the past century.

One degree Centigrade.

That's too much for the ice to withstand.

In the last year, we've had a global assessment of ice losses

from Antarctica and from Greenland.

And they tell us that things are worse than we'd expected.

The Greenland ice sheet is melting.

It's lost four trillion tonnes of ice,

and it's losing five times as much ice today as it was 25 years ago.

If you go to the southern hemisphere, in the past,

most of the models predicted that Antarctica would grow.

That's not the case.

Antarctica's losing three times as much ice today

as it was 25 years ago.

In Antarctica, really small changes in ocean temperature in particular

melt a lot of ice.

The ocean is only about half a degree centigrade warmer

than it should be.

But that's melting colossal amounts of ice from enormous glaciers.

The water that melts from the ice sheets ends up in one place,

and that's the oceans.

And that's when it starts to affect people around the rest

of the planet.

The sea level has been stable for several thousand years.

But if the ice sheets lose icebergs faster and faster to the ocean,

the sea level goes up.

We know that sea level has already risen by about 20 centimetres

in the last 100 years.

Rising seas are displacing hundreds of thousands of people from already

vulnerable coastal areas in the South Pacific,

Indonesia, Bangladesh.

The impact on families

is going to be something

that I don't think

we could ever prepare for.

In the United States, Louisiana's on the front line

of this climate crisis.

It's losing land at one of the fastest rates on the planet,

at about the rate of a football field every 45 minutes.

The Isle de Jean Charles was once home to 400 people.

But subsidence caused by oil and gas extraction,

and now rising seas, means that in the last six decades

much of it has disappeared.

Before, this was all land.

But due to sea-level rise, slowly but surely it's washing away.

What we're looking at here is where I was born

and raised, in 1946.

It's sad.

Very, very sad to see what happened to my mom and dad's home,

and where they raised us at.

I want to finish my life, as well, over here.

For the people on Isle de Jean Charles,

they're running out of options.

And now what we see is just 10% of what used to be there.

We have been working with the state to move an entire community.

This is the first time the federal government of the United States

has offered dollars for the relocation of folks

due to climate change.

When it comes to relocation, this is the only place

I've ever known as home.

I don't want to abandon it,

I don't want to forget it.

A lot of people say that this land that we're living on won't be here

in 20 years from now.

That's kind of hard to think about, where you grew up

isn't going to be here any more.

The residents of Isle de Jean Charles have been labelled

as the first climate refugees in the United States.

And that may be true.

But what we know for sure is that they won't be the last.

Sea levels are not only increased by melting ice.

The world's oceans are expanding because they're getting warmer.

Over 90% of the increased heat trapped in our atmosphere

has been stored in the oceans.

I've witnessed the devastating effect this is having.

In the last three years, repeated heat stress has caused

a third of the world's corals to first bleach and then die.

Our generation is going to be responsible for the loss

of one of the most majestic ecosystems on the face of the Earth.

We're literally watching the death of this natural wonder.

In many ways, what's happening now across the world

doesn't come as a surprise.

Much of what we're now experiencing, scientists warned about

over 30 years ago.

What we're seeing at the moment is exactly what we predicted.

What I'd like to do today is to start with Dr James Hansen.

In the summer of 1988, I testified to Congress.

Number one, the Earth is warmer in 1988 than at any time

in the history of instrumental measurements.

I said I was 99% confident that this was a real,

physical effect of the increasing carbon dioxide.

The Earth is warming by an amount which is too large

to be a chance fluctuation.

James Hansen was absolutely a pioneer in trying to reach

the public and politicians.

He played a major role, there's no doubt, in putting

climate change on the international agenda.

Those who think we're powerless to do anything about this

greenhouse effect are forgetting about the White House effect.

The short-term response was pretty good.

We are the Lord's creatures, the trustees of this planet.

The politicians were saying the right things,

that we should avoid dangerous human-made changes to climate.

It's just that the policies needed to achieve that were never adopted.

There are many reasons we haven't acted on climate change.

Science is definitely part of the story.

The science is complicated.

Economists had to look at, "OK, what are the costs are going to be?"

And then technologists had to work out,

"Well, what actually can we do about it?"

And that's one of the reasons why it took a long time for governments

really to put policies in place.

However, there was also resistance.

Let's be honest about this.

There are incumbent industries that then,

they knew about climate change, but they didn't really want

anything to happen.

Net income grew 17%...

Earnings rose to $10.9 billion...

The organisations that had the most to lose by acting on climate change

were the fossil fuel companies.

The most profitable industry possibly in the history of mankind,

making huge profits.

They wanted to continue that.

$11.7 billion profit.

Many of those industries, basically the oil and gas industry,

the fossil fuel industry, they undertook a quite concerted

campaign to confuse the science and confuse the message.

This is industry funded and industry driven.

Fossil fuel companies engaged PR consultants who used exactly

the same tactics that have been used by the tobacco companies,

and there's ample documentation.

The basic strategy is to cast doubt on the science.

The science is so distorted and mis-stated.

To promote the message that we don't really know,

there isn't a consensus.

There are too many complexities around climate science.

And it will be too expensive to fix anyway.

We've had flatline temperatures globally for the last eight years.

The cycle of denial has worked.

And even today, the President of the United States

says that it's not true.

All of this with the global warming, and a lot of it's a hoax,

it's a hoax. I mean, it's a moneymaking industry. OK?

In the UK, we have the Climate Change Act from 2008,

which was the first law anywhere in the world to make a

legally binding target for reducing greenhouse gas emissions.

But what we've also seen here is a number of people

in politics who've decided really to campaign against action

on climate change.

There's plenty of evidence that warming will bring benefits

as well as maybe disadvantages.

The arguments have been, well, climate change is happening

but it may not be that serious.

There are huge benefits from a warming planet.

In the IPCC's own report, there's fewer deaths

from cold-related diseases.

They say we should just adapt to it rather than try to reduce

greenhouse gas emissions.

And of course that's very attractive to politicians.

Because to decide not to do something is much more comfortable.

I think that many of us were willing to hear that message

because we too depend upon fossil fuels for our lifestyle.

So we're all implicated in this economic system,

but it's not like we're all equally responsible, right?

There's no doubt that that seeding of doubt has slowed the transition

to a clean-energy economy.

We haven't entirely wasted the 30 years but it would have been so easy

to solve the problem if we had started gradually to make

fossil fuels more expensive and develop the technologies

to replace them.

But we didn't do that.

And now there are consequences.

Greenhouse gas emissions have continued to rise

and the problem is getting harder to solve.

The world's great forests play a vital role in determining

the balance of carbon dioxide in our atmosphere.

Trees and plants absorb carbon dioxide, using it to build

their leaves, stems and roots.

In this process of photosynthesis, they have sucked up and stored

nearly a third of our emissions.

The main driver of climate change is greenhouse gas emissions.

Forests are one of our ways out.

They are like the lungs of the planet.

They are big climate regulators at a global scale.

July 23rd, 1972.

My work has always been about monitoring

the land surface and forest.

Thrusting outward into space, we gain new perspective

on ourselves.

Since 1972 till now, Landsat has been tracking

and taking pictures of the Earth's surface.

Circling the Earth, it offers an ideal means

to monitor change.

In 2008, the US government says it's open free of charge

and accessible over the internet.

Millions of images, automatically.

It's just this huge leap in capability.

It was only then where we saw the whole planet.

And when you see the whole, it was a bit of a revelation.

And, yeah, the alarm bells go off.

These warm orangey tones, that's forest disturbance,

that means forest was removed.

We didn't know that was going on.

Colombia, Peru, Paraguay, Bolivia.

We can go anywhere and see actual forest be cleared.

It usually starts with logging.

Rainforests are cleared and burned.

They then replace it with soybeans, rubber, pasture for cattle.

But one of the big drivers is palm oil.

Palm oil is like a magical fruit.

We all have palm oil in our houses right now.

It's found in almost every good you can think about.

It's in soaps, it's in shampoo.

It's in chocolate, it's in bread.

It's even in crisps.

What we're doing, accidentally and inadvertently,

is actually causing deforestation in other countries because of our

demand for this product.

That means the natural system is not working.

Habitats are disappearing.

But also when these high carbon stock forests,

that are centuries old, are cleared and burned,

CO2 is added to the atmosphere.

Those emissions go up and warm the planet.

When you look at our maps, our results are showing

that it's accelerating.

It almost looks like a contagion.

You know, it looks like a disease across the planet.

I mean, the ever-increasing pattern.

If we continue this level of deforestation, we'll take it all.

And our ability to mitigate climate change and turn the story

around becomes really vanishingly small.

Trees are now being cut down and burnt at such a rate,

that nearly a third of our carbon dioxide emissions

are caused by deforestation.

It sucks.

I'm a pretty light-hearted, optimistic guy.

But just looking at this data, you just look at the stories,

I'd like to see some evidence

of a really strong, strong kind of

unified political response that was more than an aspiration

on a kind of piece of paper, right?

That would be cool.

Looking ahead to the future, we know that if we continue

releasing carbon dioxide into our atmosphere,

temperatures will keep rising and the consequences

will get progressively worse.

But do we know how much worse?

There are thousands of scientists around the world,

in almost every single country, working to understand

what will happen in the future if we don't act, we don't do more.

So we use really powerful climate models, which are numerical

representations of the whole of the Earth system.

The oceans, the land, the atmosphere and the ice

on the planet.

And then we drive it with increased carbon dioxide,

based on predictions of the future and then we see what the model does.

They predict that if we carry on as we are now,

where CO2 continues to increase, we would hit 1.5 degrees

global warming by between 2040 and 2050.

We're on course to go through 1.5 degrees in just a few decades' time,

and the models differ slightly as to exactly when.

And not long after that, we're on a trajectory to go

through two degrees.

Whilst we don't know exactly what a two degree warmer world

will look like, there's growing evidence about the consequences

of crossing this threshold.

We know that with increased storms, increased floods, droughts

and heat waves, production of food will be more problematic.

It really becomes difficult to see at such levels of warming

how we're going to maintain our agriculture,

such that the population of the world can actually feed itself.

Ensuring people have access to clean, safe drinking water

will become much more difficult.

Developing countries are at the front line

of this battle.

Those parts of the globe which will suffer the most

and the soonest are not those parts of the globe which have actually

loaded all those carbon dioxides into the atmosphere

in the first instance.

But you have to understand, this is also a crisis for the world.

The fact is that if the poor are suffering today,

then the rich will also suffer tomorrow.

As we look further into the future, predicting how our climate system

might behave becomes more complex.

There's uncertainty in climate projection, not least

because we don't know what our generation when we're older

is going to be doing and what the future generations

are going to be doing.

But based on our current trajectory, the various models predict

that by the end of the century, our planet will be somewhere

between three and six degrees hotter.

Even if we are looking at the bottom end of predictions,

that's still really bad.

Over 600 million people live in coastal areas

that are less than ten metres above sea level.

Some models predict if we don't do anything to curb climate change,

then we could be looking at 80 centimetres to a metre

of sea level rise by the end of the century.

So sea level is dangerous for us in the UK, as indeed elsewhere.

The main impacts of what might seem a gradual rise of sea level

is the risk from storms, surges of sea

that we've never seen before.

If we lose all our coastal cities, we've got a different planet

and we've got a economic situation which is out of control.

While there's a lot we understand about what the future might hold,

the big fear is that there may be other, more extreme dangers

lurking beyond those we already know about.

Scientists call these tipping points.

A tipping point is where in a part of the climate system,

just a little bit of extra warming could nudge it into

a different state, an irreversible change.

At the moment, it is our ongoing emissions that are driving

global temperatures up.

But if we cross tipping points, that could spiral beyond our control.

If we imagine a map of the world, it turns out that there are climate

tipping points dotted all around it.

Greenland and West Antarctica could be tipped

into irreversible meltdown.

There are major ecosystems that we could tip

into an alternative state.

For example, triggering a climate-induced dieback

of the rainforest, turning it into a savannah.

Once you've crossed a tipping point, that's it.

You've triggered a catastrophic change.

It's going to carry on getting even hotter,

because you've triggered something that you can't undo.

One of the potential tipping points scientists have identified

involves a greenhouse gas locked underground.

We know that there's large amounts of methane stored in the permafrost

in the Arctic, and we're worried that as that permafrost starts

to actually unfreeze, the methane trapped underneath

will start to bubble up.

Few bubbles down in there.

When we look down into the ice, we see white pockets of gas.

We can see that there are bubbles in the surface layer

and then there's a whole column of bubbles that stacks up.

When this ice sheet melts, the gases are released

into the atmosphere and you can actually hear the gases coming out.

GAS HISSES

Let's have a look.

These flares that we're doing demonstrate that the bubbles

contain methane.

It's a very potent greenhouse gas.

Methane is 21 times more powerful as a greenhouse gas than CO2.

So you can imagine a large amount of gas burping out of the permafrost

actually causing the acceleration in the global warming

that we see already happening.

You look out across the millions of lakes in the Arctic,

you start to wonder just how much methane

all of these lakes could release.

The future looks alarming indeed, but it's not without hope.

There is still time, if we act now with determination

and urgency.

What do governments, industries, nations and we, as individuals,

need to do to change our course?

At the 2015 United Nations climate summit in Paris,

for the first time ever, nearly every country in the world

came to an agreement.

It set an objective to hold temperatures below two degrees

and try to limit warming to 1.5.

If we want to try and keep the global climate to 1.5 degrees,

we have to half our carbon emissions by 2030 and then hit

zero carbon emissions globally by 2050.

This poses a huge challenge, as emissions must be cut from almost

every part of the economy.

But 25% come from how we produce electricity and heat,

and alternatives are already within our grasp.

It's actually not that complicated.

We need to shift our energy system away from fossil fuels that produce

greenhouse gases and towards renewable energies that don't.

Every country has got a different resource.

In Norway, you've got an awful lot of hydro power.

If you're in India or Morocco, there's lots and lots of sun.

The problem was that renewables were much more expensive

than fossil fuels.

But what's happened recently is rapid falls in the price

of renewable energy.

Solar power has led the way with this.

Germany went first with of many of the key technologies in solar,

and China really picked up the baton.

There's tremendous technological innovation taking place

around the world.

Solar power is now the cheapest form of newly installed electricity

in more than 60 countries.

We're seeing a huge growth in renewable energy.

Despite entrenched fossil fuel interests,

they've been unable to stop that transition.

And we've got to do even more.

In the UK, for a long time, we've been considering

future energy sources.

It used to be ten, 20 years ago that nuclear power

offered a relatively cheap way through.

And one really good advantage of nuclear is that

it doesn't produce emissions.

But what's become clearer recently is that some technologies

are performing better than others.

And increasingly, that's been about wind.

Here in the UK, we are building some of the biggest offshore

wind turbines in the world.

The bigger the turbine, the more wind can be captured.

Just one revolution of these blades can power a house for a day.

With the increased capacity, wind resource is about to become

as cheap and much cheaper in the future, than fossil fuels.

So far, around 30% of the UK's electricity

comes from renewable sources.

If that is to continue to grow, we'll need to develop

parallel systems to keep our energy reliable and store what we produce.

The bit that comes next, that means that we have to

decarbonise industry and we've got to decarbonise

the transport sector.

And that means using things like electric vehicles,

battery-powered vehicles,

potentially even hydrogen-powered vehicles.

We know what we have to do.

We really have to get on and do it.

And this is the political decision and the brave decision

that needs be taken.

Do we incur a small cost now, not insignificant cost,

let's be clear on it, or do we wait and see

the need to adapt?

And the economics is really clear on this,

that the costs of action are dwarfed by the costs of inaction.

If we take this path now, we could potentially buy ourselves time

to crack some of the most challenging sources

of emissions, like aviation.

One of the major barriers to obtaining electric flight

is the power that we can get from batteries today.

But we are seeing strides being made and seeing a reduction in the weight

of these batteries.

Recently, the world's first fully electric plane

made it across the Channel.

This was a single-passenger 60 kilowatt power jet.

Now we're trying to retrofit a 20 tonne aircraft and get it flying.

We'll be replacing one of the engines with an electric motor

driving the fan.

We're going to take these hybrid electric systems and test them

in the air, test them in flight at different altitudes

and different temperatures.

And this is going to give us the key to understand how we might integrate

these systems for future aircraft designs.

To limit warming to 1.5 degrees, as well as reducing the amount

of carbon dioxide we release into the atmosphere,

we need to find ways to reduce the vast amount

that's already there.

There's a great deal of interest in the kind of technologies

that we might have that could actually remove carbon dioxide

from the atmosphere.

Now, the first thing to say is

we already have these technologies and they're called trees.

If we reforest and rewild vast areas of the world, then we can

lock up huge amounts of carbon that is currently in the atmosphere.

In the future, there are other technologies that might work.

Like direct air capture.

This is one of the world's first carbon collectors.

Air is sucked into the collector.

Inside there is a filter unit that absorbs CO2.

The CO2 sticks to the filter.

And then it's dissolved in water.

And under high pressure, we pump it down to 1,800 metres.

It's the same as the depth of the Grand Canyon.

And there it enters the bedrock.

This is a core taken from deep within the ground at the site

where we injected our CO2.

It's basalt.

The water just flows through these pores and reacts

with the rock.

So the white that we see here is the CO2 turned into stone.

So it's not affecting our atmosphere.

Technologies like this may be able to help us in the future,

but to meet emission targets, action is needed now.

Can what we do as individuals make a difference?

So the average UK person has got a carbon footprint of roughly

13 tonnes of carbon dioxide equivalent, per person, per year.

And that's everything that they buy and do,

traced right back down the supply chain.

And we can pick a few things to start with that will make

a really significant difference.

They should be making our homes as energy efficient as possible.

That can be as simple as getting your house insulated

so you waste less energy, which by the way, will save you money.

Everything that we buy, even if we can't see it,

has a carbon footprint.

From smartphones, to clothes, to furniture.

We've all become completely used to buying things

produced using fossil fuels.

A lot of the time we really don't know that.

Take a washing machine, mainly made out of metal

and that starts off with a mine.

Ore is going to be taken to the blast furnace

to extract the metal.

An enormous amounts of fossil fuel is going to be used.

And then parts are turned into components,

more emissions again.

Lastly, it's shipped all over the world to arrive

at your local shop.

So we need to think about buying less physical products.

When we do so, buy higher quality and then make it last.

We've been such a wasteful world, especially in the more developed

parts of the world.

You actually can be far less wasteful

and not affect the quality of your life at all.

Food is about a quarter of our carbon footprint in the UK.

If we take three steps, then we can cut that in half.

First step, just to eat everything that we buy.

In the UK, we waste an enormous proportion of our food.

And second, avoid air freighted food which is about 100 times

as impactful as putting it on a boat, and suddenly becomes

a carbon disaster.

Lastly, the most important thing to do is to reduce our meat

and dairy consumption, especially beef and lamb.

The problem is not traditional farming techniques.

The problem is with intensive farming.

It takes a lot of resources to rear an animal, and cows and sheep

are especially high impact because they ruminate,

which means they burp up methane.

And the science on this is absolutely clear cut.

Our studies have shown that if we take these three steps,

we could knock perhaps even two tonnes off the average

UK person's carbon footprint.

These things really do matter.

They only get you part of the way.

But again, if we don't have them, we won't make the final target.

What happens next is up to us all.

I truly believe that together we can bring about the

transformative change that is needed.

Where your influence really kicks in is the way that you push

for the cultural change that we need to see

and the political change that we need to see.

People being able to make their voice heard really matters.

You should not underestimate your own power or underestimate

your own significance to change people's minds

and change people's behaviour.

When I was younger, I had lots of plans of becoming different things,

everything from an actor to a scientist.

But then my teachers in school told me about climate change.

That was sort of an eye opener to me.

The more I read about it, the more I understood how dangerous

it was for everyone.

I stopped going to school.

I stopped talking because I was just so sad.

And then...

that made me very concerned.

One day, I decided that this was enough.

I wasn't going to accept this any more.

My future and everyone else's future is at risk

and nothing is being done.

No-one is doing anything.

So I have to do something.

So I sat myself down on the ground outside the Swedish parliament

and I decided that I wasn't going to go to school.

The first day I sat all alone.

Then the second day, people started joining me.

I wouldn't have imagined in my wildest dreams

that this would happen.

It happened so fast.

I know hundreds and thousands of pupils follow you

by not going to school.

You are on the front pages of the most influential

newspapers and magazines.

I saw that nothing was happening and no-one was doing anything.

So then I have to do something.

And I want to be able to, when I grow, to look back and say

that I did what I could back then.

What do we want?

Climate justice! When do we want it? Now!

It is amazing that tens of thousands of children all around the world

have done the same thing as I did...

..saying that why should we go to school, if there's no future?

And why should we learn facts

when the most important facts don't matter?

I've learned that you are never too small to make a difference.

And if a few children can get headlines all over the world,

just by not going to school, then imagine what we could all

do together if we really wanted to.

Change is coming, whether you like it or not.

Today was a day led by the children in dozens of protests

across the country.

Save our planet!

We still have time to turn everything around,

to pull the emergency brake and to take action.

But that short period of time isn't going to last for long.

There's a message for all of us in the voices of these young people.

It is after all their generation who will inherit this dangerous legacy.

We now stand at a unique point in our planet's history,

one where we must all share responsibility both for our

present wellbeing and for the future of life on Earth.

Every one of us has the power to make changes and make them now.

Our wonderful natural world and the lives of our children

and grandchildren, and all those who follow them,

depend upon us doing so.