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Global warming

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Global warming S1 Science Planet Earth topic Fact Theory or Lie? Water boils at 100 C Plants produce oxygen Oxygen is the most common gas in the air The universe ... – PowerPoint PPT presentation

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Title: Global warming


1
Global warming
  • S1 Science
  • Planet Earth topic

2
Its to do with the Earth heating up and if we
dont do something about it were all going to
die.
Humans are causing it.
Its caused by carbon dioxide, which is a very
dangerous gas.
What is global warming?
Global warming is the same thing as the
greenhouse effect. They are bad for the planet.
3
Learning outcomes Success criteria
Understand 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.

4
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5
Fact Theory or Lie?
6
Water boils at 100?C
7
Plants produce oxygen
8
Oxygen is the most common gas in the air
9
The universe started with a Big Bang
10
The greenhouse effect is a bad thing
11
The sun takes 365 days to go around the earth
12
The earth is a sphere
13
The Earth is getting hotter
14
Carbon dioxide is causing the Earth to get hotter
15
Burning fossil fuels like petrol produces carbon
dioxide
16
Humans are causing global warming
17
Global warming will stop if humans stop producing
so much carbon dioxide
18
Global Warming and The Greenhouse Effect
19
Definitions
  • Global warming
  • the increase in the average temperature of the
    Earth caused by an increase in the levels of
    greenhouse gases, due to human activity.
  • 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.

As defined by New Scientist magazine
20
The Greenhouse Effect
21
Most of the heat lost back into space
Greenhouse gases trap some of the heat on Earth
Heat travels from the sun to the Earth
22
Facts
  • It is totally natural
  • It is vitally important it keeps the Earth 20 -
    30?C warmer than it would be otherwise
  • Without it life on Earth would not exist

23
  • The media confuse the Greenhouse Effect and
    Global Warming and often use the terms
    interchangeably.
  • Often they refer only to Global Warming why
    actually they mean the Greenhouse Effect.

24
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25
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26
Greenhouse Gases
  • We need them!

27
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.

28
Role of Greenhouse Gases in Heat Absorption
Other gases
Water vapour
Water vapour
Carbon dioxide
Carbon dioxide
29
In summary
  • Greenhouse Effect good!
  • Global Warming bad!

30
Learning outcomes Success criteria
Understand 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.
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