Global warmingS2 Chemistry

Materials from the Earth

What is global

warming?

It’s to do with the Earth

heating up and if we don’t do

something about it we’re

all going to die.

Humans are causing it.

It’s caused by carbon dioxide,

which is a very

dangerous gas.

Global warming is the same thing as

the greenhouse effect. They are bad for the planet.

Learning outcomes Success criteriaUnderstand the difference between “global warming” and “the greenhouse effect”.

You can write definitions for “global warming” and “the greenhouse effect”.

You can draw a diagram which shows how the greenhouse effect works.

You can list the three main greenhouse gases in order of their importance.

You can explain whether the greenhouse effect is a good or bad thing.

FactTheory

or Lie?

Water boils at 100C

Plants produce oxygen

Oxygen is the most common gas in the air

The universe started with a Big Bang

The greenhouse effect is a bad thing

The sun takes 365 days to go around the earth

The earth is a sphere

The Earth is getting hotter

Carbon dioxide is causing the Earth to

get hotter

Burning fossil fuels like petrol produces carbon

dioxide

Humans are causing global warming

Global warming will stop if humans stop producing so much carbon dioxide

Global Warming

and

The Greenhouse

Effect

Definitions

• “Global warming”:– the increase in the average temperature of the

Earth.

• Although related, is NOT the same thing as the “Greenhouse Effect”

• “The Greenhouse Effect”:– is ability of the planet to trap heat, caused by

greenhouse gases absorbing heat energy from the sun.

The Greenhouse Effect

Heat travels from the sun to

the Earth

Most of the heat lost back into space

Greenhouse gases trap some of the

heat on Earth

Facts

• It is totally natural

• It is vitally important – it keeps the Earth 20 - 30C warmer than it would be otherwise– Without it life on Earth would not exist

• The media confuse the Greenhouse Effect and Global Warming and often use the terms interchangeably.

• Often they refer only to “Global Warming” when actually they mean the Greenhouse Effect.

Greenhouse Gases

We need them!

Greenhouse Gases

• The most important greenhouse gases (in order) are:– Water vapour (60%)– Carbon dioxide (15%)– Methane– Nitrous oxide– Ozone

• Draw a pie chart to show this information, divided into: “water vapour”, “carbon dioxide” and “other gases”.

Water vapour

Carbon dioxide

Role of Greenhouse Gases in Heat Absorption

Water vapourCarbon dioxide

Other gases

In summary…

• Greenhouse Effect – good!

• Global Warming – bad!

What is global

warming?

It’s to do with the Earth

heating up and if we don’t do

something about it we’re

all going to die.

Humans are causing it.

It’s caused by carbon dioxide,

which is a very

dangerous gas.

Global warming is the same thing as

the greenhouse effect. They are bad for the planet.

Learning outcomes Success criteriaUnderstand the difference between “global warming” and “the greenhouse effect”.

You can write definitions for “global warming” and “the greenhouse effect”.

You can draw a diagram which shows how the greenhouse effect works.

You can list the three main greenhouse gases in order of their importance.

You can explain whether the greenhouse effect is a good or bad thing.