4.9.2.2 Human activities which contribute to an increase in greenhouse gases in the atmosphere

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human activities increase the amounts of greenhouse gases in the atmosphere. These include:

• carbon dioxide (CO2)

• methane. (CH4 )

2
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Examples of human activity include:

o Driving (CO2 )

o Consuming electricity (CO2 )

o Raising livestock (cows – CH4 )

o Decay of organic waste in landfill sites (CH4 )

3
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How do scientists believe human activity will affect the earths temperature

-Based on peer-reviewed evidence,

-many scientists believe that human activities will cause the temperature of the Earth’s atmosphere to increase at the surface

-and that this will result in global climate change

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Why is it difficult to model global climate change

it is difficult to model such complex systems as global climate change

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How does this affect models and the evidence for global warming

This leads to:

-simplified models,

-speculation

-and opinions presented in the media

that may be based on only parts of the evidence and which may be biased.

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