9.3 Climate change and the carbon footprint
5 exam questions worth 10 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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What is a carbon footprint?
Choose one answer.
Correct Not quite: the answer is The total greenhouse gases emitted over a product's life cycle
Mark scheme
A
Model answer
A: the total greenhouse gases emitted over the full life cycle of a product, service or event.
Give three possible effects of global climate change.
Mark scheme
any three from:
- sea level rise / flooding (1)
- more extreme weather / storms (1)
- changes in rainfall (1)
- water / temperature stress (1)
- changes in food production (1)
- changes in wildlife distribution (1)
Model answer
Rising sea levels, more frequent severe storms, and changes to where food can be grown.
Give two ways to reduce the carbon footprint of electricity generation.
Mark scheme
any two from:
- renewable sources / wind / solar / nuclear (1)
- carbon capture and storage (1)
- energy efficiency / using less electricity (1)
Model answer
Use renewable energy resources such as wind and solar, and capture and store the carbon dioxide from power stations.
Give two reasons why it is difficult to reduce carbon footprints.
Mark scheme
any two from:
- cost / economic considerations (1)
- people unwilling to change lifestyle (1)
- lack of public information (1)
- needs international cooperation (1)
- scientific disagreement (1)
Model answer
It is expensive, and people are often unwilling to change their lifestyles.
Explain why scientists cannot predict exactly how much the global temperature will rise.
Mark scheme
- the climate is very complex (1)
- models are simplified / depend on future emissions (1)
Model answer
The climate system is extremely complex, so models have to be simplified, and future emissions are unknown.
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