Global warming

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Global warming

• S1 Science
• Planet Earth topic

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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.
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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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FactTheory or Lie?
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Water boils at 100?C
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Plants produce oxygen
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Oxygen is the most common gas in the air
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The universe started with a Big Bang
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The greenhouse effect is a bad thing
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The sun takes 365 days to go around the earth
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The earth is a sphere
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The Earth is getting hotter
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Carbon dioxide is causing the Earth to get hotter
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Burning fossil fuels like petrol produces carbon
dioxide
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Humans are causing global warming
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Global warming will stop if humans stop producing
so much carbon dioxide
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Global Warming andThe Greenhouse Effect
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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
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The Greenhouse Effect
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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
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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

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• 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.

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Greenhouse Gases

• We need them!

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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.

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Role of Greenhouse Gases in Heat Absorption
Other gases
Water vapour
Water vapour
Carbon dioxide
Carbon dioxide
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In summary

• Greenhouse Effect good!
• Global Warming bad!

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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.