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chapter 1

the earth’s climate

many scientists talk about climate

change

they even predict the next end of the

world

there are serious consequences for the

planet

people are frightened

but how bad is it really

mark twain once said that a lot of

people talk about the weather but no one

can say anything really important about

for the past hundred years humanity has

been talking about the changes in the

weather

about storms hurricanes heat waves and

floods

each country has its own troubles

today the earth’s climate has a huge

effect on the daily lives of all the

people in the world

it has always had a big effect on life

on earth and it had a big effect on how

life started billions of years ago

so what is climate

climate is the usual weather in a place

over a long time normally 30 years or

more

weather can change quickly and a place

can have very different weather from one

day to the next

but climate is those weather patterns

over a long time

on earth lots of things have an effect

on the climate the atmosphere the oceans

the land ice people plants and animals

and the light and heat from the sun the

earth’s atmosphere is a thin layer of

gases above the earth

the earth’s atmosphere

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most of the atmosphere is nitrogen and

oxygen but there are other gases in the

atmosphere too

some of the gases in the atmosphere are

called greenhouse gases because like the

glass in a greenhouse they keep the

earth warm

they do this by stopping some of the

sun’s heat from leaving the earth

they are very important because they

help to keep the earth at the right

temperature for life to grow not too hot

and not too cold

carbon dioxide is a very important

greenhouse gas

without the greenhouse gases the earth

would be very very cold

many scientists study the earth’s

atmosphere

they do this from satellites and from

the land and the studies show that the

amount of greenhouse gases in the

atmosphere is growing

this is making the temperature on earth

get warmer and this warming is having a

big effect on the climate

we are already seeing the effects of

this all over the world

weather patterns are changing

the water in the oceans is getting

warmer snow and ice are melting in the

arctic and antarctica and sea levels are

increasing these effects can cause many

problems for the people on earth and for

the beautiful plants and animals that

live on earth too

they could mean there is not enough food

and water for everyone they could have a

damaging effect on people’s health and

they could make some people poorer we

need to act now to stop climate change

and to make a better future for our

world if we do not act now we will put

the future of our world in danger

chapter 2

a warmer world

weather stations across the world give

us information about the temperature on

the earth’s surface

we also get information from ships and

boys in the oceans

all this information helps scientists to

decide if the temperature on earth is

going up or going down

information from the last 150 years

shows that the temperature on the

earth’s surface has gone up

the temperature in some places has

increased more than others

and the warming in the arctic is greater

than in all other places on earth

some years have always been warmer or

colder than others

and the earth’s climate has changed a

number of times in the past

this is because natural things can cause

the earth’s temperature to change from

one year to the next

or to change over a longer time

these things include the amount of heat

coming from the sun

the effect of volcanoes

and weather patterns like el nino

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but for many years scientists have

talked about climate change

and the warming of the earth

each of the past four decades has been

warmer than the one before

the information we get from weather

stations ships and boys shows that since

the year 2000 the earth’s temperature

has been

0.75 degrees celsius warmer than it was

150 years ago

but in

2015 the temperature became one degree

celsius warmer than 150 years ago

this is a big increase

and scientists are worried about it

other studies also show that the earth

is getting warmer

for example studies show that the

temperature of the oceans is increasing

from the surface right down to the

bottom of each ocean

other studies show that the amount of

snow and ice on the earth’s surface is

getting smaller

melting ice and increasing sea levels

the warming of the earth is causing the

arctic sea ice to melt

in the 2010s

at the end of the summer the arctic sea

ice was one third smaller than at the

end of the 20th century

that’s a change of the same size as the

uk

ireland france spain

germany and italy put together

when the arctic sea ice melts it can

change the weather patterns in europe

asia and north america

as the earth gets warmer the water in

the oceans gets warmer too

this makes the water expand

get larger

this makes sea levels increase

also the land ice in greenland and

antarctica is melting

and this too causes sea levels to

increase

studies show that sea levels across the

world are increasing

when sea levels increase floods from

storms can be more dangerous for people

living near the sea

many of the world’s biggest cities like

shanghai in china

jakarta in indonesia

and mumbai in india are very close to

the sea

higher sea levels put these cities in

danger of floods

the floods in new york city in 2012

showed the damage that big storms can do

these floods caused huge problems for

the people of new york city

they damaged homes and other buildings

and many people had no electricity in

their homes

this meant no heat no light and no way

to cook food or heat water

the damage caused by big storms can have

an effect for many years and can cost

billions of pounds

for now the thames barrier on the river

thames in london protects the city from

floods

but if sea levels increase the barrier

might need to be bigger

and many other cities across the world

do not have anything to protect them

from higher sea levels and the floods

they can cause

the warming of the earth puts all of

these cities in danger

in many places building a barrier like

the thames barrier is either not

possible

or too expensive

chapter 3

the effects of a warmer world

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heat waves droughts floods and storms

heat waves droughts floods and storms

are all extreme weather

a heat wave is very hot weather for many

days and a drought is very little rain

for a long time

extreme weather can cause huge damage to

buildings and roads and to people and

animals

the damage caused by extreme weather can

cost billions of pounds and many people

can lose their lives

in 2016 there was an extreme heat wave

in india

the country had its highest ever

temperature at 51 degrees celsius and

many people died

in europe in 2003 there was a summer

heat wave that killed tens of thousands

of people

most of these people were old because

very hot weather can cause more problems

for older people

in australia there have been many large

fires over the last few years in the

australian summer the land and the

plants growing on the land can get very

dry

it is then easy for a fire to start and

to become very large very quickly

these fires badly damage people’s homes

and other buildings and many people lose

their lives in the fires

since the year 2000 parts of the uk have

had floods again and again and these

floods have caused huge amounts of

damage

in 2010 there were extreme floods in

pakistan

these floods had a terrible effect on 20

million people in the country

many people lost their lives and even

more people lost their homes

it takes a huge amount of time and money

to help people after damaging weather

like this

all over the world we are seeing

patterns of extreme weather

many places are having their highest

ever temperatures and other places are

having more rain than ever before

the effects of this extreme weather are

very dangerous for all the living things

in our world

the number of heat waves droughts floods

and storms we are seeing is increasing

in many places

extreme weather is now becoming normal

for many people

there has always been extreme weather

but studies show that climate change has

increased the risk of extreme weather

a warmer world increases the risk of

europe having a big heat wave for

example

studies on the floods in the uk show

that the risk of extremely heavy rain is

greater because of climate change and

this has made the risk of floods in this

part of the world higher

one reason for this is because a warmer

atmosphere can hold more water so the

rain is heavier and the risk of floods

is greater

the effects on people and where they

live

climate change can also have an effect

on our food and water and on our health

all over the world we grow food on farms

much of the food we buy at supermarkets

starts its life in a field or on a farm

but the food we grow needs the weather

to be just right not too hot not too

cold not too wet and not too dry

droughts and floods have a very damaging

effect on how much food we can grow

when fields become too wet or too dry

plants cannot grow

this can increase the price of food and

then poor people cannot buy it

these people then have to go hungry

some plants may grow better in a

different climate

but scientists think that the effects of

climate change will make it much harder

to grow enough food for everyone

climate change may also have an effect

on the amount of water that we have and

many places may not have the water they

need

across south asia and china water for

drinking and farming comes from large

rivers

the water in these rivers comes from

rain and snow and from ice melting high

up in the himalayan mountains

climate change can have an effect on all

of these things

this means lower amounts of water in the

rivers and lower amounts of water for

people to drink and use

climate change and extreme weather can

also have a damaging effect on our

health

more people could catch some diseases in

a warmer world

dirtier air can also damage the health

of all living things

the many effects of climate change can

make people feel worried about their

lives and their families

when people do not have the food and

water they need it can cause problems

between groups of people and communities

sometimes people move from their homes

to try to find a better place to live or

to find enough food and water

the effects on animals

climate change is causing problems for

many of the animals that live on the

earth

changes in temperature the seasons

spring summer autumn and winter and the

amount of food and water animals can

find all make life much more difficult

for animals in different parts of the

world

when changes to the climate are slow

animals can find ways to live with the

changes

but when changes to the climate happen

very quickly it is much more difficult

for animals to do this

the climate change we are seeing right

now is happening very quickly and it is

damaging for many of the living things

on earth

at the same time animals are losing

their habitats the places they live

people cut down trees to build towns and

cities and to grow food in fields

all of these things take habitats away

from animals

together climate change and losing

habitats make life very difficult for

the animals of this world

we may see some animals become extinct

in the future because of climate change

many animals already have problems and

there are very low numbers of some

animals in today’s world

more climate change may mean that these

animals become extinct and we never see

them again

many people already know about the polar

bear and the problems it now has in its

habitat the arctic

the arctic ice is melting

this makes catching seals to eat very

difficult for polar bears because they

walk on the ice to do this

polar bears are not the only animals at

risk from the warming of the earth

all over the world there are other

animals that could become extinct

because of climate change

many others will find life much more

difficult

many of australia’s animals have lost

their habitats because of climate change

these animals include the yellow-footed

rock wallaby the golden shouldered

parrot and lumholtz’s tree kangaroo

many of our medicines and all the plants

and animals we use for food come from

the natural world

in the future we may not have the large

numbers of different animals and plants

that we see on earth today

this will make the world a poorer and

sadder place for the people living on

earth in the future

the effects on companies and communities

some companies and communities are

already seeing the bad effects of

climate change and extreme weather

people buy insurance to protect their

homes if something bad happens

but it is going to become more difficult

for these companies to give insurance

against floods for example

when floods happen more often the cost

of insurance increases

insurance companies will find it more

and more difficult to protect these

homes because it costs so much money

food and water companies are also seeing

the effects of droughts floods and other

extreme weather and these effects are

increasing

in 2011 there was an extreme drought in

texas in the united states of america

many farms could not grow food or grass

for cows because there was no rain

the farmers lost billions of dollars

because they had no food to sell

other companies make electricity using

the water moving in rivers

but when there are lower amounts of

water in these rivers they cannot make

the electricity they need

this has been a big problem for many

communities in brazil

all of these things can make the price

of insurance food water and energy go up

doing nothing to stop climate change now

may make prices higher for companies and

for people in the future

many companies are now trying to stop

climate change and the warming of the

earth

they are trying to find ways that the

world can grow and develop without

putting more carbon dioxide into the

atmosphere

together companies are working towards a

future that makes money but does not

damage the earth finding ways to live in

our warmer world and to stop the

temperature increasing could mean more

jobs and a better future for communities

chapter 4

climate change then and now

climate change in the

past the earth’s climate has always

changed and this has had a huge effect

on life on earth

over millions of years the climate has

changed many times

it has been very very cold with lots of

snow and ice everywhere

it has also been very very hot with

forests of trees growing in the arctic

and antarctica

for the past 2.6 million years the earth

has always had some ice in the arctic

and antarctica

but the climate has changed in a pattern

sometimes warmer and sometimes colder

this pattern comes from the natural

changes in the way the earth moves

around the sun

there have been many ice ages in the

earth’s past

at these times there was a large amount

of ice over north america

europe and asia

the amount of ice was last at its

largest about 22 000 years ago

at this time the sea levels across the

earth were about 130 meters lower than

they are today

there were fewer people in the world

then

and scientists think that there were

only about

130 000 people living in europe

between the ice ages the earth was

warmer and there was not as much ice

at these times the sea levels were

higher and there were different plants

and animals living on the earth

at the end of the last ice age there

were fast and extreme changes in the

climate

that together with people killing

animals to eat may be the reason why the

woolly mammoth became extinct

climate change today

many scientists study the climate and

climate change

their studies show that people are the

biggest cause of climate change today

many of the things that people do

increase the amount of greenhouse gases

in the atmosphere

and it is these gases that are making

the temperature of the earth increase

more greenhouse gases in the atmosphere

carbon dioxide co2

methane ch4

nitrous oxide n2o and others

mean more of the energy we get from the

sun cannot leave the earth

this makes the earth warmer

plants and animals take carbon sea from

the atmosphere

these plants and animals then die and

their bodies go into the ground

over millions of years the bodies of

plants and animals can become fossil

fuels

people then burn these fossil fuels in

their homes in factories and in cars

buses and planes

when we burn fossil fuels the carbon

inside them is put back into the

atmosphere as carbon dioxide

people do many other things that put

greenhouse gases into the atmosphere

cutting down trees in forests

deforestation

growing food and keeping animals on

farms

and making things in factories all

increase the amount of greenhouse gases

in the earth’s atmosphere

across the world levels of carbon

dioxide in the atmosphere are over 45

percent higher than in 1750.

in 1750 there were about

280 parts per million

but in june 2016

even at the halle research station in

antarctica there were high levels of

carbon dioxide in the atmosphere

over 400 parts per million

chapter 5

the causes of climate change

carbon sinks and carbon in the

atmosphere

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on earth there is a carbon cycle

carbon dioxide is a very important gas

for life on earth

plants need it to live

they take in carbon dioxide use the

carbon to grow and then put oxygen back

into the atmosphere

people and animals then take in this

oxygen use it to live and put carbon

dioxide back into the atmosphere

when plants and animals die the carbon

in their bodies can go back into the

atmosphere as carbon dioxide or it can

go into the ground in their bodies

the carbon dioxide on earth moves

between the land and the atmosphere and

between the ocean and the atmosphere too

a carbon sink is something that takes in

carbon and holds it for a long time

the land and forests on earth are huge

carbon sinks because they take in a lot

of carbon dioxide

this is called the land sink

the oceans also take in a lot of carbon

dioxide so they are huge carbon sinks

too

this is called the ocean sink

together the land sink and ocean sink

take in and hold over half the carbon

dioxide that people put into the

atmosphere

the other half stays in the atmosphere

because there is nowhere for it to go

and no way for it to get out

the carbon sinks on earth are very

important

they stop the earth from getting even

warmer

every year people put about 40 billion

tons of carbon dioxide into the earth’s

atmosphere

most of this carbon dioxide comes from

burning fossil fuels and from factories

but some of it comes from deforestation

and from changing the way we use the

land

over the years since the last ice age

the earth has become about 4c to 5c

warmer

this warming was because of the natural

changes in the way the earth moves

around the sun

this change in temperature has had a

huge effect on the earth its climate and

the plants and animals that live here

if we do not stop putting so much carbon

dioxide into the atmosphere the earth’s

temperature may increase by another 4c

to 5c by the end of the 21st century

this would cause huge problems for all

the living things on the earth

the energy we use now and in the future

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across the world people use 20 times

more energy today than they did in 1850

in this time there has also been a

change in the energy we use

in the past we burned wood and used

energy from the wind and from the water

in rivers

today we burn a lot more fossil fuels

than we did in the past as we built more

and more factories we started to use

more and more fossil fuels

we also started to drive cars and travel

in planes and this burns fossil fuels

too

today 80 percent of the energy we use

comes from fossil fuels

energy from other things including wood

and water is just 20 of the energy we

use

right now energy from the sun and from

the wind is just three percent of the

energy we use but this is growing

quickly

the energy we get from the sun and wind

is much better for the earth than fossil

fuels because it is clean and does not

put any greenhouse gasses into the

atmosphere

countries need to work hard to increase

the amount of clean energy they use

for countries around the world getting

clean energy to people at a low price is

one of the biggest problems of the 21st

century

as the number of people in the world

grows the amount of energy we need also

grows and this is becoming a bigger and

bigger problem for everyone

around the world more than 1 billion

people live without electricity for heat

and light in their homes

most of these people live in africa and

asia

over 3 billion people still use wood in

their homes for cooking and this can

make the air inside their homes very

dirty and dangerous

it can have a very bad effect on their

health and millions of people die every

year because of dirty air inside their

homes

outside fossil fuels also have a bad

effect on people’s health

burning fossil fuels in factories and in

cars and buses causes millions of people

to die every year from dirty air

clean energy from the sun wind and water

is the best way to give people the

energy they need without having the

damaging effects on people’s health and

on the earth’s climate

cutting down forests and damaging soils

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forests are one of the biggest carbon

sinks on earth

across the world forests take in carbon

dioxide and hold it in their trees

plants and the soil under them

when we cut down trees most of that

carbon dioxide goes back into the

atmosphere

for thousands of years people have cut

down forests to use the land for farming

this deforestation put a lot of carbon

dioxide into the atmosphere and also

caused some animals to become extinct

tarpans were wild horses and aurochs

were wild cows and both of these animals

became extinct

when people cut down forests in europe

asia and north africa

in the last century the deforestation of

rainforests in some parts of the world

has become a big problem

some of these rainforests are on soils

that hold a huge amount of carbon

these soils have taken in the carbon

slowly over thousands of years when

people cut down the trees in these

rainforests they damage the soil under

the trees and this puts the carbon

dioxide back into the atmosphere

farming can also damage soils and put

even more carbon dioxide into the

atmosphere

today people are still cutting down

forests often to build huge farms

over the last 150 years 25 percent of

the carbon dioxide put into the

atmosphere by people is because of

deforestation

cutting down forests has a bad effect on

the water cycle too and this can make

droughts worse in some parts of the

world

deforestation also puts many animals and

plants in danger because it takes away

their habitats

it may cause many animals to become

extinct in the future

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past and present changes in carbon

dioxide

the carbon dioxide levels in the

atmosphere today are much higher than at

any time in the last 800 000 years

we know this because many scientists

work in antarctica and study the ice

there

scientists take ice cores from the

antarctic ice and use them to find out

about the earth’s climate in the past

these ice cores show that the changes in

the last century are not part of earth’s

natural cycles

the ice in antarctica has built up over

hundreds of thousands of years over this

time snow fell and made layers that

built up to make the thick ice that we

see in antarctica today

every time the snow fell small amounts

of air also got inside the ice and could

not get out

scientists can take ice cores from more

than 3000 meters down to find air from

hundreds of thousands of years ago

by studying this air they can find out

about the atmosphere in the past

we can also study the soil at the bottom

of the ocean to find out about the

earth’s atmosphere a very long time ago

all of these studies show that carbon

dioxide is going into the atmosphere

more quickly now than at any time in the

past 50 million years

today’s changes in carbon dioxide levels

are not because of natural causes but

because of people

most of the carbon dioxide in the

atmosphere today will be there for many

years

some will stay in the atmosphere for

thousands of years

this means that we will see the effects

of this carbon dioxide for many years to

come

[Music]

chapter 6 the risks of climate change

acidic oceans

the high levels of carbon dioxide in the

atmosphere are having a bad effect on

our oceans across the world oceans are

becoming more acidic

the last time the oceans on earth were

so acidic was about

250 million years ago

at this time a huge number of animals

became extinct

about 30 percent of the carbon dioxide

people put into the atmosphere goes into

the oceans

this stops so much carbon dioxide

staying in the atmosphere

ocean sinks stop the temperature on

earth from getting even higher

but they also make the water in the

oceans more acidic

scientists are starting to understand

the effects that acidic water has on the

animals that live in the ocean

many of the very small animals in the

ocean like corals are really important

for other ocean animals and for people

for example people eat a lot of fish and

these fish eat smaller fish and other

small animals in the ocean

if the numbers of these smaller animals

get very low because they are killed by

acidic water there will be lower numbers

of bigger fish

this could then cause a problem for all

the animals that live in the ocean

including those that people eat

so acidic oceans may cause a big problem

for people too

lower numbers of fish and other sea

animals will make life very difficult

for communities that live near the sea

and catch and sell them as food

it will also make food that comes from

the sea more difficult to buy and more

expensive

reefs are in danger

acidic oceans and warmer sea water are

both very bad for corals and many corals

are dying in oceans across the world

storms dirty sea water and other ocean

animals also damage coral reefs

people are now very worried about the

future of the ocean’s beautiful coral

reefs including australia’s great

barrier reef

the risk of large climate changes

as the world gets warmer there is a risk

of large and dangerous changes to the

earth’s climate

and once these changes happen we may

never be able to go back to the climate

we have today

even small increases in temperature can

have a big effect on the thick ice over

greenland and west antarctica

if this ice melts it will cause sea

levels to increase maybe by many meters

this would have a huge effect on the

land next to the sea all around the

world

studies show that the ice in greenland

is melting more every summer

there is also information to show that

the thick ice in west antarctica is

melting and that the damage to the ice

is very large

some scientists think we may never be

able to stop this ice melting

changes to rain patterns can cause

forests to become very dry

and this can increase the risk of fire

fire and drought can really damage thick

forests

then the forests may become dry land

with only grass and no trees

this land cannot hold as much carbon so

more carbon stays in the atmosphere

this increases temperatures and causes

more changes to rain patterns

many people are worried that this cycle

may cause many of the trees in the

amazon rainforest to die

there are many other large changes to

the climate that may happen in the

future these include huge droughts huge

changes in natural rain patterns and

huge changes in the ocean

the ocean moves warm and cold water

around the earth and this has a big

effect on the climate

changes in how this water moves can

cause huge changes to the climate in

different parts of the world

scientists are also worried about the

increase in temperature in the arctic

the arctic holds a large amount of the

greenhouse gas methane ch4

as the temperature increases this

methane can get into the atmosphere

this is a huge problem because methane

is a much stronger greenhouse gas than

carbon dioxide

[Music]

increasing sea levels

over the last few decades we have seen

the effects of climate change all over

the world in all places and all oceans

climate change has had an effect both on

the natural world plants and animals and

on people and communities

today the earth’s temperature is about

one degree celsius warmer than it was

150 years ago

the warmer the world becomes the worse

the effects are for the natural world

and for people communities and companies

many people live on small islands around

the world

and these people are very worried about

the effects of climate change

some islands are only a few metres above

sea level so floods are a huge problem

for them if sea levels increase

studies show that four hundred thousand

years ago the earth was warmer and a

large part of greenland had no ice over

it for a long time

the melting ice caused sea levels to

increase and they became more than six

meters higher than they are today

scientists think that the temperature at

this time was only a little warmer than

the temperature today

this shows how important it is to stop

the earth’s temperature increasing

anymore

what to do about climate change

in 2015 the world’s countries met in

paris in france to talk about climate

change and what to do about it

they agreed to take steps to keep the

earth’s warming to well below 2 degrees

celsius

they agreed to try to keep warming below

1.5 degrees celsius but they know that

this will be difficult

to try to do this they agreed to cut the

amount of greenhouse gases they put into

the atmosphere

this was a very positive step

these plans will help to stop the

warming of the earth and are good in

many other ways

the plans could help to make the air

cleaner

stop the water in the oceans becoming so

acidic

and help people to live a healthy life

all of these things can have a positive

effect on people’s lives

cutting carbon

in paris in 2015 countries agreed to cut

the amount of carbon dioxide and other

greenhouse gases they put into the

atmosphere

to stop the earth’s warming going above

1.5 degrees celsius

people need to stop putting any carbon

dioxide into the atmosphere by the

middle of this century

this means that we need to cut the

amount of carbon dioxide we put into the

atmosphere right now

the amount of carbon dioxide we can put

into the atmosphere before there is a

large risk of dangerous levels of

warming

is called a carbon budget

the more of the carbon budget we use now

the lower it will be in the future

together countries must plan how to use

the carbon budget so that we do not use

it all too quickly

[Applause]

for the earth’s warming to stay below

1.5 degrees celsius the carbon budget is

about

[Music]

600 billion tons

but scientists think that since 1870

we have already put 2

200 billion tons of carbon dioxide into

the atmosphere

this means we have already used 2

200 billion tons of the carbon budget

and we only have about 400 billion tons

left

[Music]

400 billion tons of carbon dioxide

sounds like a huge amount

but right now people across the world

put more than 40 billion tons of carbon

dioxide into the atmosphere every year

we need to stop burning fossil fuels

cutting down forests and damaging soils

if we do not we will use all of the

world’s carbon budget to stay below 1.5

degrees celsius in the next 10 to 15

years

even if we stop putting any carbon

dioxide into the atmosphere the

temperatures on earth will stay warm and

this will cause changes to the climate

for hundreds of years in the future

because of the greenhouse gases already

in the atmosphere the oceans will slowly

warm the ice in the arctic and

antarctica will melt and sea levels will

increase for many years to come

[Music]

energy solutions

to make a better future for the earth

people all over the world need to cut

the amount of greenhouse gases they put

into the atmosphere

today we burn a huge amount of fossil

fuel and this is one of the biggest

reasons why we put so much carbon

dioxide into the atmosphere

we need to stop burning fossil fuels and

to only use clean energy in the future

we can get clean energy from a number of

places the wind the sun plants

the water moving in rivers and the ocean

hot rocks under the ground and other new

ways of making energy

nuclear energy also puts very few

greenhouse gases into the atmosphere but

it is expensive

in the future scientists also need to

find ways of making better batteries so

we can keep electricity and it can be

used at a later time

the batteries we use today do not hold

enough electricity

better batteries will also help us to

move from cars and buses that burn

fossil fuels to cars and buses that use

electricity

there is another step we can take to

help to stop climate change

scientists need to find ways of taking

carbon dioxide from factories and other

places that make it

and keeping it under the ground

making new carbon sinks can help to cut

the carbon dioxide going into the

atmosphere

we must also try not to use more energy

than we need

we need to find ways of using a smaller

amount of energy in our homes and in

factories

people are now using computers to help

to cut the amount of energy we use and

to put more clean energy into people’s

homes

scientists also need to find ways of

taking large amounts of carbon dioxide

out of the atmosphere without causing

any other problems for the world

this needs to happen quickly

very quickly if we want warming to stay

below 1.5 degrees celsius

forest solutions

the earth’s forests are an important

part of the solution to cutting

greenhouse gases in the atmosphere and

stopping climate change

forests are one of the biggest carbon

sinks on the earth

we need to stop deforestation

protect the earth’s natural forests and

grow more trees and forests

this includes growing forests on land

that is not good for farming

stopping deforestation is a very

difficult thing to do

around the world people cut down forests

to use the land for farming

this is an important way for many

countries to make money and for people

to make money to buy food and clothes

for their families

people need to see how important forests

are because then they will stop cutting

them down

this has already happened in many places

around the world

many countries now understand that

rainforests help to protect and to

develop their communities

these forests have a positive effect on

the amount of rain and clean water

communities have for farming and on the

rivers that some companies use to make

electricity

forests also help to protect the land

and soil

and to lower the number of floods

communities have

forests do a natural job of protecting

soils and this is important for the food

and water we need and use every day

protecting forests is a good way to cut

the amount of carbon dioxide we put into

the atmosphere

and it has a positive effect on many

other things too

in west africa people are helping cocoa

farmers to make more money from the

cocoa they grow without cutting down

more trees and forests

this includes growing cocoa plants and

trees together in ways that give farmers

more food from the same land

farmers are then making more money for

their families and for their countries

but carbon stays inside the trees in the

rainforests and does not go into the

atmosphere

food and farming solutions

farming can also be part of the solution

to climate change

farmers can use ways of farming that

build up carbon levels in soils

soils are a very important natural

carbon sink

some soils are better than others

for example soils that have very small

living things in them can change dead

plants into food for new plants to grow

this can help farmers to grow the plants

we eat these soils are also very good at

holding carbon

farmers can help to make these good

soils

they can do this by often changing the

plants that they grow on their land and

by not always growing the same plants

they can also help by sometimes growing

plants on the land and sometimes keeping

animals on it

these two steps can help to make soils

healthy

these good soils also hold more water

this means that they can protect plants

from drought and this makes farming

easier in a warmer

climate the amount of carbon dioxide we

put into the atmosphere can also be cut

by thinking about the food we eat

only growing the food we need and not

throwing food away will help not eating

so much meat and other foods that come

from animals will also help to cut the

greenhouse gases we put into the

atmosphere

earth’s natural cycles

the earth and its living things run in

cycles

the water cycle and the carbon cycle are

very important patterns for life on

earth

soils use the good things from dead

plants to grow new plants

in natural cycles everything is used

again

but in today’s world people often do not

do things in cycles

we make things and then we use them

when we finish using things we throw

them away

when we throw things away they often go

into the land the atmosphere or the

oceans

we do not use them again or get back the

energy or things we used to make them

this means that we use a lot of energy

and natural things but doing things in

cycles does not use as much energy or

natural things

and does not put so much carbon dioxide

into the atmosphere

companies need to do things in new and

different ways

they must try to find ways of using

everything again and throwing nothing

away just like natural cycles

we need to look at the natural cycles on

earth and try to do things in the same

way

many companies are already using these

ideas to make new things and to help

stop climate change

for example companies are using natural

cycles to develop new fuels

the future

[Music]

coming together to stop climate change

climate change is a problem for all the

people of the world

one country on its own cannot find the

solution

all the countries of the world need to

work together on this problem

countries also need to work together to

develop in a way that is good for the

earth and does not damage it

together they need to help poor

countries and communities to have a

positive future

many people from across the world have

asked for countries to do more to stop

climate change

in 2015 in paris countries agreed to cut

the amount of fossil fuels they burn to

protect forests and to increase the

health of their soils

this was a very positive day for climate

change

the steps that countries agreed to take

in paris are still not enough to stop

warming going above 2 degrees celsius

but the countries all agreed to do more

in the future

cutting the amount of greenhouse gases

we put into the atmosphere will help to

stop the temperature on earth increasing

more

this is very positive for the future

but many people around the world will

still have to live with the effects of

climate change

so in paris countries also agreed to

help people to find ways to live in our

warmer world

and to protect them from the effects of

higher temperatures

making a better life for everyone

trying to find solutions to the problem

of climate change can be a very positive

thing for many people and many companies

across the world companies can look for

new things to make and new ways of doing

things

they can work together with new people

and can make new jobs

finding solutions to climate change

could make life better for people in

many different ways

lots of companies are now developing

clean energies and this is making many

new jobs

building companies are making new houses

that are comfortable use very little

energy and are cheaper to live in

[Music]

all the large car companies are now

moving away from fossil fuels and are

making cars that use electricity

[Music]

companies are also looking at ways of

using new fuels in their cars and

airplanes including fuels from plants

this will cut the amount of carbon

dioxide we put into the atmosphere

a lot of companies are now working with

the idea of zero deforestation in

everything they do

people cut down trees in forests all

over the world

but in some forests people cut down a

tree and then grow a new tree

this is called zero deforestation

companies across the world are now only

using trees from forests like this

[Music]

countries communities and companies are

trying to build a different future

without people putting greenhouse gases

into the atmosphere

this idea is growing fast and is now

making a lot of money

countries can help this change happen

faster

they can make it cheaper to make and use

cleaner energy

and more expensive to make and use

fossil fuels

asking companies to develop clean ways

of doing things can make more jobs

stronger communities and a better

climate for everyone

one earth

for hundreds of years we have used more

and more from the natural world but

there is still only one earth

the number of people living on earth

grows every day and every day we have a

bigger and bigger effect on the earth

for the communities of the world to have

a positive future we must find ways of

living on the earth without damaging it

in the way we do today

we are already seeing the bad effects of

climate change but things may be much

worse for our children and our

grandchildren

we need to see that the earth is in

danger and act now to find solutions

everyone must work towards stopping

climate change on our own and together

we can all help

every day we can decide to do things

that cut the amount of carbon dioxide we

put into the atmosphere

every day we can take positive steps to

keep the natural world healthy

we have had a bad effect on the natural

world for too long

and we need to stop now

if we are good to the earth only then

can the earth be good to us

[Music]

第 1 章

地球气候

许多科学家谈论气候

变化

他们甚至预测下一个世界末日 对

地球

造成严重后果

人们感到害怕,

但它到底有多糟糕

马克吐温曾经说过很多

人谈论天气,但 没有人

能说出任何真正重要的

事情 在过去的一百年里 人类

一直在谈论天气的变化

关于风暴 飓风 热浪和

洪水

今天每个国家都有自己的麻烦 地球气候

对所有人的日常生活产生了巨大的影响

世界上的人们

它一直对地球上的生命产生重大影响,它对

数十亿年前生命如何开始产生重大影响

所以什么是气候

气候是一个

地方很长一段时间内的通常天气,通常是 30 年或

更多的

天气可能会迅速变化,一个地方的

天气可能会从一天到另一天非常不同,

但气候是地球

上很长一段时间内的那些天气模式

事物

对气候有影响 大气

海洋 陆地冰 人 植物和动物

以及来自太阳的光和热

地球大气是

地球上方的一层薄薄的气体

地球大气

[音乐]

大部分大气是 氮气和

氧气,但大气中也有其他气体

大气

中的一些气体被

称为温室气体,因为就像温室中的玻璃一样,

它们使

地球保持温暖,

它们通过阻止一些

太阳热量离开地球

来做到这一点 非常重要,因为它们

有助于将地球保持在

适宜生命生长的温度,不会太热

也不会太冷

二氧化碳是一种非常重要的

温室气体

没有温室气体地球

会非常非常冷

许多科学家研究地球的

大气层

他们从卫星和陆地上做到这一点

,研究表明

大气中温室气体的数量

正在增加,

这使得 地球上的

温度越来越高,这种变暖

对气候产生了很大的影响,

我们已经在世界各地看到了这种影响

天气模式正在改变

海洋中的水正在

变暖

北极和南极洲的冰雪正在融化 海平面正在

上升 这些影响会给

地球上的人们以及生活在地球上

的美丽动植物带来许多问题

它们可能意味着每个人都没有足够的食物

和水 它们可能

对人们的健康和

它们可能会使一些人变得更穷 我们

现在需要采取行动来阻止气候变化

并为我们的世界创造更美好的未来

如果我们现在不采取行动 我们将使

我们世界的未来处于危险之中

第 2 章

世界变暖

我们提供

有关地球表面温度的

信息 我们还从海洋中的船只和男孩那里获得信息

所有这些信息都有助于科学家

决定是否 地球

温度上升或

下降 过去 150 年的信息

显示,

地球表面

温度上升 某些地方的温度

上升幅度

大于其他地方,北极地区的变暖幅度

大于其他所有地方 在地球上,

有些年份总是比其他年份更暖或

更冷

,而地球的气候在过去发生了

多次变化,

这是因为自然事物会

导致地球温度从

一年到下一年

或在更长的时间内发生变化

这些东西包括

来自太阳

的热量、火山的影响

和厄尔尼诺等天气模式

[音乐]

但多年来科学家们一直在

谈论气候变化

和地球变暖,

过去 40 年中的每一年

都比

我们从

气象站船舶和男孩获得的信息之前的一个显示,

自 2000 年以来,地球的温度

一直是

0.75 摄氏度 比 150 年前温暖,

在 2015 年,

温度比 150 年前高出 1 摄氏度,

这是一个很大的增长

,科学家们对此感到担忧。

其他研究也表明地球

正在变暖

,例如研究表明

温度 海洋的数量

从表面一直到

海洋底部都在增加

其他研究表明,

地球表面的冰雪量

越来越少

冰融化和海平面上升

地球变暖导致

北极海冰 到

2010 年代夏末融化,北极

海冰比 20 世纪末小三分之一

,这与

英国、

爱尔兰、法国、西班牙、

德国和意大利

在北极海冰融化时的总和一样大 融化它可以

改变欧洲亚洲和北美的天气模式

随着地球变暖

海洋中的水也变得温暖

这使得水膨胀

变得更大

这使得海平面上升

,格陵兰岛和南极洲的陆地冰正在融化

,这也导致海平面

上升

研究表明,

当海平面上升时,世界

各地的海平面都在上升

世界上许多最大的城市,例如

中国的上海,

印度尼西亚的雅加达

和印度的孟买,都非常

靠近大海

更高的海平面使这些城市

面临

洪水的危险 2012 年纽约市

的洪水表明,大风暴可以造成

这些破坏 洪水给纽约市的人们带来了巨大的问题,

他们破坏了房屋和其他建筑物

,许多人的家中没有电,

这意味着没有暖气,没有光,也

无法做饭或加热水

。大风暴造成的破坏可能会

造成 影响多年,目前可能耗资

数十亿英镑

伦敦泰晤士河上的泰晤士河屏障保护城市免受

洪水侵袭,

但如果海平面上升 增加屏障

可能需要更大

,世界上许多其他城市

没有任何东西可以保护它们

免受更高的海平面和洪水的影响,

它们可能导致

地球变暖,这使得所有

这些城市

在许多地方都处于危险之中

像泰晤士河这样的屏障要么

不可能,

要么太贵

第 3 章

世界变暖的影响

[音乐]

热浪 干旱 洪水和风暴

热浪 干旱 洪水和风暴

都是极端

天气 热浪是非常炎热的天气很多

天, 干旱是长时间很少下雨

极端天气会对

建筑物和道路以及人和

动物造成巨大

的破坏 极端天气造成的损失可能会

造成数十亿英镑的损失,许多人

可能会

丧生 2016 年出现了极端高温

印度

的热浪 该国的最高

气温为 51 摄氏度,

许多人

在 2003 年在欧洲死亡 夏天的

热浪导致数十人死亡 在成千上万

的人中

,这些人中的大多数都是老年人,因为

非常炎热的天气会给澳大利亚的老年人带来更多的问题

在过去的几年中,澳大利亚夏季发生了许多大火

,土地和土地上

生长的植物会变得非常

干燥

后,火灾很容易开始

并很快变得非常大

这些火灾严重破坏了人们的房屋

和其他建筑物,许多人

在火灾中丧生

自 2000 年以来,英国部分地区

一次又一次地遭受洪水, 这些

洪水在 2010 年造成了巨大的

破坏

巴基斯坦

发生了极端洪水 这些洪水对该国 2000 万人造成了可怕的影响

许多人失去了生命,甚至

更多的人失去了家园

这需要大量的时间和金钱

为了帮助世界各地像这样的破坏性天气后的人们,

我们正在看到

极端天气的模式,

许多地方都出现了

有史以来最高的气温和 其他地方的

降雨量比以往任何时候都多

这种极端天气的影响对我们世界上

的所有生物都非常危险

我们看到的热浪 干旱 洪水和风暴的数量

在许多地方正在增加

极端天气现在对我们来说变得

很正常 许多人

总是有极端天气,

但研究表明,气候变化

增加了极端天气的风险

一个变暖的世界增加了

欧洲发生大热浪的风险

例如

,对英国洪水的研究

表明,极端天气的风险

由于气候变化,降雨量更大,

这使得世界这一地区发生洪水的风险

更高,

原因之一是因为更温暖的

大气可以容纳更多的水,因此

降雨量更大,洪水

风险更大

气候变化也会

影响我们的食物和水以及我们

在世界各地的健康 我们在农场种植粮食

我们在超市购买的食物是

在田间或农场开始

生长的,但我们种植的食物需要

天气恰到好处 不太热 不

太冷 不太湿也不太干

干旱和

洪水对

当田地变得太湿或太干时,我们可以种植多少食物

植物无法生长

这会增加食物的价格,

然后穷人就买不起了

这些人不得不挨饿

有些植物可能在不同的气候下生长得更好,

但科学家们认为

气候变化的影响将使

为每个人种植足够的食物变得更加困难

气候变化也可能

对我们拥有的水量产生影响,并且

在整个南亚和中国的许多地方可能没有他们需要的水

饮用水 农业来自大

河流

这些河流中的水

来自雨雪和喜马拉雅山脉高处融化的冰

气候变化可能对所有这些事物产生影响

这意味着 l

减少河流中的水量,减少

人们饮用和使用的水量

气候变化和极端天气

也会对我们的健康产生破坏性影响

更多人可能会在

更温暖的世界中感染一些疾病

更脏的空气也会损害人们的

健康 所有

生物 气候变化的诸多影响

会使人们对自己的

生活和家庭感到担忧

当人们没有所需的食物和

水时 它会导致

人群和社区之间的问题

寻找更好的居住地

或找到足够的食物和水

对动物的

影响 气候变化正在

给地球上的许多动物带来问题

温度变化

春夏秋冬季节以及

食物和水动物的数量

当气候变化缓慢时,

动物可以发现世界不同地区的所有动物的生活都变得更加艰难 可以忍受这些

变化,

但是当气候变化很快发生时

,动物就很难做到这一点

,我们现在看到的气候变化

正在迅速发生,它对地球上

的许多生物造成了破坏

与此同时,动物正在失去

它们的栖息地,它们居住的地方

人们砍伐树木以建造

城镇和在田间种植食物

所有这些事情都将栖息地

从动物身上夺走

气候变化和失去

栖息地使动物的生活变得非常困难

在这个世界上,

我们可能会看到一些动物

在未来因为气候变化而灭绝

许多动物已经有问题,而

当今世界上一些动物的数量非常少

更多的气候变化可能意味着这些

动物已经灭绝,我们再也见不到

它们

了 人们已经知道

北极熊以及它现在在其栖息地面临的问题

北极 北极冰正在融化

这使得捕捉 北极熊很难吃海豹,

因为它们

在冰上行走,因此

北极熊并不是唯一

面临地球变暖风险的

动物,还有其他动物可能

因气候变化而灭绝,还有

许多其他动物 会发现生活变得更加

艰难

许多澳大利亚的动物

由于气候变化而失去了栖息地

这些动物包括黄脚

岩袋鼠 金肩

鹦鹉和伦霍兹树袋鼠

我们的许多药物以及

我们用作食物的所有动植物都来自 未来

的自然世界

中,我们可能没有今天在地球上看到的

大量不同的动植物,

这将使未来的地球上的人们变得更加贫穷和

悲伤

对公司和社区的影响

一些公司和社区

已经看到

气候变化和极端天气的不良影响

人们购买保险来保护他们 r

房屋,如果发生不好的事情,

但这些公司将变得更加难以为

洪水提供保险,例如,

当洪水更频繁地发生时

,保险成本会增加,

保险公司会发现

保护这些房屋越来越困难,

因为它需要花费 这么多钱

食品和水公司也

看到了干旱 洪水和其他

极端天气的影响,这些影响

在 2011 年还在增加 美国德克萨斯州发生了极端干旱,

许多农场无法为奶牛种植食物或草

,因为 没有

下雨,农民损失了数十亿美元,

因为他们没有食物可卖,

其他公司利用

河流中流动的水发电,

但是当这些河流中的水量较少时,

他们就无法生产

所需的电力,

这是一个很大的问题

巴西许多社区的问题

所有这些都可能导致

保险食品水和能源的价格上涨

现在不采取任何措施来阻止气候变化

可能会使未来公司和人们的价格更高

许多公司现在正试图阻止

气候变化和地球变暖

他们正试图找到在

不增加投入的情况下世界能够发展和发展的方法

二氧化碳排放到

大气

中 公司正在努力

创造一个既能赚钱又不会

破坏地球

的未来

现在

过去的气候变化 地球的气候一直在

变化,这对地球上的生命产生了巨大的影响

数百万年 气候

变化了很多次

它非常非常寒冷,

到处都有很多冰雪

在过去的 260 万年里,在北极和南极洲生长的森林一直非常炎热,

地球总是有一些 ic e 在北极

和南极洲,

但气候变化的模式

有时更暖有时更冷

这种模式来自

地球围绕太阳运行的方式的自然变化

地球过去曾经历过许多冰河时期

在这些时期

北美和

亚洲上空有大量冰层 大约 22 000 年前,冰层数量上一次达到

最大

时,地球上的海平面

比现在低 130 米左右

世界上的人越来越少

然后

,科学家们认为,

在冰河时代之间,欧洲只有大约 13 万人生活在地球上,当时地球

温暖,冰层不多

,海平面

较高,地球上生活着不同的植物

和动物

。 上一个冰河时代结束时,气候

发生了快速而极端的变化

,再加上人们

为了吃动物而猎杀动物,这可能是猛犸象灭绝的原因

今天,

许多科学家研究气候和

气候变化,

他们的研究表明,人类是

当今气候变化的最大原因

,人们所做的许多事情都会

增加大气中温室气体的含量

,正是这些气体造成

了 地球温度增加

了大气中更多的温室气体

二氧化碳二氧化碳

甲烷ch4

一氧化二氮n2o等

意味着我们从太阳获得的更多能量

不能离开地球

这使得地球变暖

植物和动物从大气中吸收碳海

这些 然后植物和动物死亡,

它们的身体进入

地下数百万年

植物和动物的身体可以变成化石

燃料

人们然后在

他们的家中,工厂,汽车,

公共汽车和飞机中燃烧这些化石燃料

当我们燃烧化石燃料时,碳

当二氧化碳

人们做许多其他

排放温室气体的事情时 排放到大气

中 砍伐

森林中的树木 砍伐森林

种植食物和在农场饲养动物

以及在工厂制造东西都

增加了地球大气中温室气体的

含量 全球

大气中的二氧化碳含量比全球高出 45

% 以上 1750.

在 1750 年大约有

百万分之 280,

但在 2016 年 6 月,

即使在南极洲的哈雷研究站,

大气中的二氧化碳含量也

超过百万分之 400

第 5 章

气候变化的原因

碳汇和碳 大气

[音乐

] 地球上有一个碳循环

二氧化碳是地球上生命的一种非常重要的气体

植物需要它来生存

它们吸收二氧化碳 利用

碳生长然后将氧气

放回大气中

人和动物然后 吸收这种

氧气,

当植物和动物死亡时,用它来生存并将

二氧化碳放回大气中。 es 可以

作为二氧化碳回到大气中,也可以

在其体内进入地下

地球上的二氧化碳在

陆地和大气

之间以及海洋和大气之间移动

碳汇是一种吸收

碳和 长期持有它

地球上的土地和森林是巨大的

碳汇,因为它们吸收了大量

的二氧化碳

这被称为陆地

汇 海洋也吸收了大量的

二氧化碳,所以它们也是巨大的碳汇

这就是 陆地汇和海洋汇一起被称为海洋汇

陆地汇和海洋汇

吸收并保持了人类排放

大气中

的二氧化碳的一半以上,另一半留在大气中,

因为它无处

可去,也无路可走

地球上的碳汇非常

重要,

它们阻止地球

每年变暖,人们将大约 400

亿吨二氧化碳排放到地球

大气中,

其中大部分二氧化碳来自 om

燃烧化石燃料和来自工厂,

但其中一些来自森林砍伐

和自上次冰河时代以来多年来改变我们使用土地的方式

,地球已经变暖了大约 4 到 5 摄氏度,

这种变暖是因为地球上的自然

变化 地球

围绕太阳运行的方式

这种温度变化

对地球的气候以及

生活在这里的动植物产生了巨大的影响

如果我们不停止

向大气中排放如此多的二氧化碳,地球的

温度可能会再升高 4 摄氏度

到 21 世纪末达到 5c

这将对地球上的所有生物造成巨大的问题

我们现在和未来使用的能源

[音乐]

全世界人们

今天使用的能源是 1850 年的 20 倍

这一次,

我们使用的能源也发生了变化。

过去我们烧木头,使用

风能和

河流中的水,

今天我们燃烧的化石燃料

比以前多得多 过去,随着我们建造

越来越多的工厂,我们开始使用

越来越多的化石燃料,

我们也开始驾驶汽车和

乘坐飞机旅行,今天这也燃烧化石燃料

我们使用的 80% 的

能源来自其他事物的化石燃料能源,包括 木头

和水只是我们现在使用的能源的 20

来自

太阳和风的

能量只是我们使用的能源的 3% 但这种增长正在

迅速

我们从太阳和风中获得的能量

对地球来说要好得多 比化石

燃料更清洁,因为它是清洁的,不会

将任何温室气体排放到

大气中

各国需要努力

增加清洁能源的使用量,以

供世界各国使用

以低廉的价格为人们提供清洁能源

是最大的一项 21

世纪的问题

随着世界人口

数量的增长,我们需要的能源数量也在

增长,这对世界各地

的每个人来说正成为一个越来越大的问题。

汉 10 亿

人的家中没有电取暖

和照明

这些人中的大多数生活在非洲和

亚洲

超过 30 亿人仍然

在家中使用木材做饭,这

会使他们家中的空气变得非常

肮脏和

危险 对他们的健康产生非常糟糕的影响,

每年有数百万人

因家中空气污染而死亡

化石燃料以外的化石燃料也

对人们的健康产生不良影响

在工厂、

汽车和公共汽车中燃烧化石燃料导致数百

万人死亡 一年从肮脏的空气中

清除来自太阳风和水的清洁能源

是为人们提供所需能源的最佳方式,

而不

会对人们的健康

和地球气候

造成破坏性影响砍伐森林和破坏土壤

[音乐]

森林是其中之一 世界上最大的碳

森林吸收

二氧化碳并将其保存在树木

植物和树木下面的土壤

中 数千年来,其中

的二氧化碳重新回到

大气

中,人们

砍伐森林以利用土地进行耕作

这种森林砍伐将大量

二氧化碳排放到大气中,还

导致一些动物灭绝

tarpans是野马和

野牛 上个世纪,

当人们在

欧亚和北非

砍伐森林时,野牛和这两种动物都灭绝

了 世界某些地区的雨林砍伐

已成为一个大问题,

其中一些热带雨林位于拥有巨大土壤的土壤

几千年来,这些土壤缓慢吸收的碳量 当

人们砍伐这些热带雨林中的树木时,

他们会破坏树下的土壤

,这会将

二氧化碳重新排放到大气中,

农业也会破坏土壤并释放

更多 今天的二氧化碳排放到

大气中

,在过去的 150 年里,人们仍然经常砍伐森林以建造大型农场

人类排放到大气中的二氧化碳中有 25%

是由于

森林砍伐

造成的 它带走了

它们的栖息地

它可能导致许多动物

在未来灭绝

[音乐]

过去和现在的二氧化碳变化

今天大气中的二氧化碳水平比

过去 80 万年中的任何时候都要高

我们知道这一点 因为许多科学家

在南极工作并研究那里的冰

科学家们从

南极冰中取出冰芯,并用它们来

了解过去地球的气候,

这些冰芯表明

上个世纪的变化不是地球

自然循环的一部分

在这段时间里,南极洲的冰层已经堆积了数十万年,

降雪并形成层层,

形成厚厚的冰层 我们

今天在南极洲看到,

每次降雪时,

少量空气也进入冰层,

无法出去

他们可以

了解过去的大气

我们也可以研究海底的土壤 很久以前

就可以了解

地球的大气

所有这些研究都表明,现在

二氧化碳进入大气的

速度更快 与过去 5000 万年的任何时候相比,

今天二氧化碳水平的变化

不是因为自然原因,而是

因为人类

今天大气中的大部分二氧化碳将存在

多年,

有些将在大气中停留

数千年

这意味着我们将在

未来很多年看到这种二氧化碳的影响

[音乐]

第 6 章 气候变化的风险

酸性

海洋 高水平的二氧化碳

大气中的氧化物正在对

我们的海洋产生不良影响 全世界的海洋

变得越来越酸

地球上的海洋上一次

呈酸性是在大约

2.5 亿年前

,当时大量的动物

灭绝了

大约 30% 人们排放

到大气中的二氧化碳进入

了海洋,

这就阻止了如此多的二氧化碳

留在大气中

海洋下沉阻止了

地球上的温度变得更高,

但它们也使海洋中的水

变得更酸

科学家们开始

了解 酸性水对

生活在海洋中的动物的影响 海洋中的

许多非常小的动物,

如珊瑚,

对其他海洋动物和人类非常重要

,例如人们吃很多鱼,而

这些鱼吃小鱼和其他

海洋中的小动物

如果这些小动物的数量

因为被酸性水杀死而变得非常少,

那么数量将会减少

更大的鱼,

这可能会给

生活在海洋中的所有动物带来问题,

包括人们

食用的动物。酸性海洋可能会给人们带来大

问题 生活在海边

,捕捞并作为食物出售

这也会使

来自海洋的食物更难买到,更

昂贵的

珊瑚礁处于危险之中

酸性海洋和温暖的海水

都对珊瑚非常不利,许多珊瑚

正在死亡 世界各地的海洋

风暴 肮脏的海水和其他海洋

动物也破坏珊瑚礁

人们现在非常担心

海洋美丽珊瑚礁的未来,

包括澳大利亚的

大堡礁

随着世界变暖,大气候变化的风险存在风险

地球气候

发生巨大而危险的变化,一旦这些变化发生,我们可能

永远无法回到今天的气候

即使是 sm 温度的所有升高都会

对格陵兰岛和南极洲西部的厚冰产生重大影响,

如果这些冰融化,将导致

海平面上升,可能会增加数米,

这将对世界各地靠近大海的土地产生巨大影响

研究表明,格陵兰岛的冰

每年夏天都在融化更多

还有信息表明

南极西部的厚冰正在

融化,对冰的破坏

非常大

一些科学家认为我们可能永远

无法阻止这种冰融化

降雨模式的改变会导致

森林变得非常干燥

,这会增加

火灾和干旱的风险,火灾和干旱会真正破坏茂密的

森林,

然后森林可能会变成

只有草没有树的旱地,

这片土地不能容纳那么多的碳,所以

会有更多的碳 停留在大气中,

这会增加温度并

导致降雨模式发生更多变化

许多人担心这种循环

可能会导致亚马逊雨林中的许多树木

休息到死

未来可能会发生许多其他重大的气候变化,其中包括巨大的干旱

自然降雨模式的

巨大变化和海洋的巨大变化 海洋

在地球周围移动冷暖水,这会产生很大的

影响 关于气候

变化 这种水的运动方式会

导致世界不同地区的气候发生巨大变化

科学家们也担心

北极地区的温度升高 随着温度的升高,

北极地区拥有大量的

温室气体甲烷 ch4

这种

甲烷可以进入大气

这是一个巨大的问题,因为甲烷

是一种比二氧化碳强得多的温室气体

[音乐]

在过去的几十年里,海平面不断上升,我们已经在世界

各地看到了气候变化的影响

, 所有海洋

气候变化都

对自然界的植物和动物以及

当今的人和社区产生了影响 地球温度 re 比

150

年前温暖了

大约 1 摄氏度

气候变化的影响

一些岛屿仅高出海平面几米,

因此如果海平面上升,洪水对它们来说是个大问题

研究表明,40 万

年前地球变暖

,格陵兰岛的大部分地区没有冰

长期以来,冰层融化导致海平面

上升,比现在高出六

米多

科学家认为当时的

温度只比

今天的温度高

一点,这表明阻止地球的温度是多么重要

气温不再升高

2015 年气候变化该怎么办 世界各国在法国巴黎举行会议,

讨论气候

变化和应对措施

他们同意采取措施将

地球变暖控制在 2

摄氏度以下

他们同意尝试将变暖控制在

1.5 摄氏度以下,但他们知道

这将

很难做到这一点 他们同意

减少 他们将温室气体排放

到大气中,

这是非常积极的一步,

这些计划将有助于阻止

地球变暖,并且在

许多其他

方面都很好,这些计划可以帮助使空气

清洁器

阻止海洋中的水变得如此

酸性

和 帮助人们过上健康的生活

所有这些都可以

对人们的生活产生积极影响

2015 年在巴黎减少碳排放 各国同意

减少排放到大气中的二氧化碳和其他温室气体的数量,

以阻止地球变暖

到本世纪中叶,1.5 摄氏度的人们需要停止向大气中排放任何二氧化碳

这意味着我们需要

减少二氧化碳的排放量 我们

现在排放

到大气中的二氧化碳量 在出现危险的变暖水平的巨大风险之前我们可以排放到大气中的二氧化碳

量称为

碳预算 我们现在使用的碳预算越多,它的排放量

就越低 未来

各国必须共同规划如何

使用碳预算,这样我们就不会

太快使用它

[掌声]

让地球变暖保持在

1.5 摄氏度以下 碳预算约为

[音乐]

6000 亿吨,

但科学家认为 自 1870 年以来,

我们已经将

22000 亿吨二氧化碳排放

到大气中,

这意味着我们已经使用了

22000 亿吨的碳预算,

而我们只剩下大约 4000 亿吨

[音乐]

4000 亿吨二氧化碳

听起来像 数量巨大,

但现在全世界的人们

每年向大气排放超过 400 亿吨二氧化碳

我们需要停止燃烧化石燃料

砍伐森林和破坏 ng 土壤

如果我们不这样做,我们将在未来 10 到 15 年内将

世界上所有的碳预算保持在 1.5

摄氏度以下,

即使我们停止向大气中排放任何二氧化碳

,地球上的温度将保持温暖,

这将导致 由于大气中已经存在温室气体

,未来数百年的气候将发生变化,

海洋将缓慢

变暖北极和南极洲的冰层

将融化,海平面将

在未来许多年内上升

[音乐]

能源解决

方案 为地球创造更美好的

未来 全世界的人们都需要

减少他们排放到大气中的温室气体数量

今天我们燃烧了大量的化石

燃料,这是

我们投入如此多二氧化碳的最大原因之一

我们需要停止燃烧化石燃料并

在未来只使用清洁能源的大气

我们可以从许多地方获得清洁能源

风 太阳种植

河流中流动的水 地下的海洋

热岩和其他

制造能源的新方法

核能也很少

向大气排放温室气体,

但未来成本很高

可以在以后

使用 我们今天使用的电池没有

足够的电力

更好的电池也将帮助我们

从燃烧

化石燃料的汽车和公共汽车转向使用电力的汽车和公共汽车

我们还可以采取另一个步骤来

帮助我们 阻止气候变化

科学家需要找到方法

从工厂和其他制造二氧化碳的

地方获取二氧化碳并将

其保存在地下

制造新的碳汇有助于减少

进入大气的二氧化碳

我们还必须尽量不使用更多能源

我们需要找到

在家庭和工厂中使用更少能源的方法,

人们现在正在使用计算机来

帮助减少 我们使用的能源

并将更多的清洁能源投入人们的

家中

低于 1.5 摄氏度的

森林解决方案

地球上的森林是

减少

大气中温室气体排放和

阻止气候变化解决方案的重要组成部分

森林是地球上最大的碳汇之一

我们需要停止砍伐森林

保护地球的天然森林并促进其

生长 更多的树木和森林

这包括在

不利于耕作的土地上种植森林

停止砍伐森林是世界范围内非常

困难的事情

人们砍伐森林

以将土地用于耕作

这是许多

国家赚钱的重要途径 让

人们赚钱为家人购买食物和衣服

人们需要看到森林有多重要

是因为到那时他们将停止砍伐

森林 这已经在世界上许多地方发生了 许多国家现在都明白热带雨林有助于保护和发展他们的社区 这些森林

对雨水和清洁水社区的数量

有积极影响 用于农业和

一些公司用来制造电力的河流上的

森林也有助于保护土地

和土壤

并减少洪水数量

社区拥有

森林可以自然地保护

土壤,这对于我们需要的食物

和水很重要 每天

保护森林是

减少我们排放到大气中的二氧化碳量的好方法

,它对西非的许多其他事情也有积极影响,

人们正在帮助可可

种植者从他们种植的可可中赚更多的钱

在不砍伐

更多树木和森林的情况下,

这包括种植可可植物和

树木,从而为农民提供

更多食物 然后,同样的土地

农民为

他们的家庭和他们的国家赚了更多的钱,

但碳留在热带雨林的树木中

,不会进入

大气

粮食和农业解决方案

农业也可以成为农民可以使用的气候变化解决方案的一部分

增加土壤中碳含量的耕作方式

土壤是一个非常重要的天然

碳汇

有些土壤比其他土壤

好,例如土壤中含有非常小的

生物可以将死去的

植物变成新植物生长的食物

这可以帮助农民 种植

我们吃的植物 这些土壤也非常善于

储存碳

农民可以帮助形成这些良好的

土壤

他们可以通过经常更换

他们在土地上种植的植物来做到这一点,

并且不总是种植相同的植物,

他们也可以提供帮助 有时

在土地上种植植物,有时在土地上饲养

动物,

这两个步骤有助于使土壤

健康,

这些良好的土壤也可以容纳更多的

水分 他的意思是他们可以保护植物

免受干旱,这使得

在温暖的

气候下耕种更容易我们

也可以

通过考虑我们吃的食物来减少二氧化碳的量,

只种植我们需要的食物而不是

扔掉食物 将有助于不吃

太多来自动物的肉类和其他食物

也将有助于减少

我们排放到大气中的温室气体

地球的自然

循环地球和它的生物

循环运行水循环和碳循环是

非常重要的模式 因为

地球

上的生命土壤利用枯死植物中的好东西

在自然循环中种植新植物一切都被再次使用

但在当今世界人们通常不会

循环做事

当我们把东西扔掉时,它们就被扔掉了,它们经常

进入陆地、大气或

海洋,

我们不再使用它们,或者取回

我们用来制造它们的能量或东西 m

这意味着我们使用大量能源

和自然事物,但

循环做事不会使用尽可能多的能源或

自然事物

,也不会向大气中排放太多二氧化碳

公司需要以他们必须以新的和

不同的方式做事

尝试找到

再次使用所有东西的方法,并且

像自然循环一样丢弃

任何

东西 例如气候变化

公司正在利用自然

循环来开发新的

燃料 未来

[音乐]

齐心协力阻止气候变化

气候变化是全世界所有人的问题

一个国家靠自己无法找到

解决方案

世界需要

在这个问题上共同努力

各国也需要共同努力,

以一种对

地球有益且不损害地球的方式

共同发展 他们需要帮助 贫穷

国家和社区拥有一个

积极的未来

2015 年,来自世界各地的许多人在巴黎要求各国采取更多

行动来阻止气候

变化 他们的土壤

这是气候变化非常积极的一天

各国同意在巴黎采取的步骤

仍然不足以阻止

气温上升超过 2 摄氏度,

但各国都同意在未来做更多的事情

来减少我们的温室气体排放量

排放到大气中将有助于

阻止地球上的温度进一步升高,

这对未来非常有利,

但世界各地的许多人

仍将不得不忍受气候变化的影响,

因此在巴黎,各国也同意

帮助人们找到方法 生活在我们

更温暖的世界中

,保护他们免受高温的影响,

为每个试图寻找解决方案的人创造更美好的生活

气候变化问题对世界各地

的许多人和许多公司来说

可能是一件非常积极

的事情

气候变化

可以通过许多不同的方式让人们的生活变得更好

许多公司现在正在开发

清洁能源,这正在创造许多

新的工作岗位,

建筑公司正在建造

舒适的新房子,使用很少的

能源并且生活成本更低

[音乐]

所有 大型汽车公司现在

正在远离化石燃料,正在

制造使用电力的汽车

[音乐]

公司也在寻找

在汽车和飞机中使用新燃料的方法,

包括来自植物的燃料,

这将减少我们排放的二氧化碳量

许多公司现在都在致力于

在他们所做的一切中实现零毁林的理念 人们砍伐森林中的

树木

在世界各地,

但在一些森林中,人们砍伐一

棵树,然后种一棵新树,

这被称为零毁林

世界各地的公司现在都只

使用这样的森林树木

[音乐]

国家社区和公司正在

努力建设一个不同的未来

在没有人将温室气体排放

到大气中的情况下,

这个想法正在迅速发展,现在正在

赚很多钱

国家可以帮助这种变化

更快地发生,

他们可以降低制造和使用

清洁

能源的成本,并使制造和使用

化石燃料的成本更高

询问公司 开发清洁

的做事方式可以为每个人创造更多的工作

更强大的社区和更好的

气候

一个地球

数百年来我们

从自然界中使用越来越多但

仍然只有一个地球

生活在地球上的人数在

增长 每一天,每一天,我们都

对地球产生越来越大的影响,

让世界社区拥有

一个积极的未来,我们必须

在不破坏地球的情况下找到

我们今天的生活方式

我们已经看到了气候变化的不良影响,

对于我们的子孙后代来说,情况可能会更糟

我们需要看到地球处于

危险之中 立即行动以找到解决方案

每个人都必须努力

靠自己和共同努力来阻止气候变化

我们每天都可以提供帮助

我们可以决定做一些事情

来减少我们每天排放

到大气中的二氧化碳量

我们可以采取积极的措施来

保持 自然世界健康

我们对自然

世界的影响太久了

,我们现在需要停止

如果我们对地球好只有

地球才能对我们好

[音乐]