climate change: causes · 2020-04-23 · climate change: causes learning outcomes: •understand...
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Climate Change: Causes
Learning Outcomes:• Understand the causes
of climate change.
• Evaluate whether humans are responsible for climate change.
Where have you heard the words climate change or global warming before?
What do you think they mean?
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Climate change / Global
warming
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What is global warming?
A global change in climate due to human
expansion of the “greenhouse effect”,
warming up the entire Earth.
Video link 1
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Sunlight passes through the atmosphere and warms the Earth’s surface. This heat is
radiated back toward space.
However, greenhouse gas molecules absorb this outgoing heat and re-emit in all
directions, warming the surface of the Earth and the lower atmosphere.
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Greenhouse Gases
Can you name any greenhouse gases? How are they released into the atmosphere?
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Climate Change Evidence
Have you heard of any arguments against human caused global warming?
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Maybe the Sun is to blame for global warming?
Energy output from the Sun has been measured since 1978 and over this time the data shows a very slight drop in solar irradiance.
Therefore the sun doesn’tappear to be responsiblefor the warming trend.
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Hasn’t the temperature of the Earth always fluctuated up and down though?
Yes that’s true
But the increase in temperature is the highest it has ever been, by a considerable amount.
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Are we the cause?
In what ways do you think humans are contributing to global warming?
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Human causes for
climate change
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Deforestation
The mass removal of trees for various reasons has a huge impact on the global climate.
Video link 2
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Fossil Fuels
The burning of fossil fuels for transport, industry and power produces greenhouse gases, contributing to global warming.
Video link 3
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TASK:
Create a leaflet for the general public explaining what global warming is and how humans are
contributing towards it.
EXTENSION: Produce a Frequently asked questions section, giving answers for commonly asked questions
about climate change.