Questions

Q1.

Carbon dioxide, methane and nitrous oxide are all greenhouse gases.

(a) (i) Name a source of nitrous oxide.

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(ii) Name one other greenhouse gas.
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(b) The table shows the masses of three different greenhouse gases released into the atmosphere in the
United Kingdom from 1990 to 2010.

(i) Calculate the percentage decrease in the mass of carbon dioxide released between 1990 and
2010.
Show your working.
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percentage decrease in mass = ........................................................... %

(ii) Suggest why the mass of carbon dioxide released has decreased from 1990 to 2010.
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 (iii) Describe the changes in the mass of methane released between 1990 and 2010.
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(c) Explain the advantages of reducing the mass of greenhouse gases released into the atmosphere.
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(Total for question = 14 marks)

Q2.

The table lists some greenhouse gases and gives their percentage contribution to the greenhouse effect.

(a) (i) Which gas makes the greatest contribution to the greenhouse effect?
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(ii) Name a greenhouse gas not in the table.
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(b) The percentage contribution for each gas is calculated using these three factors

• the abundance of the gas in the atmosphere

• how long the gas stays in the atmosphere
• how much radiation the gas absorbs (the gas's radiative effect)
(i) Methane has a radiative effect 72 times greater than the same mass of carbon dioxide.
Suggest why methane has a lower percentage contribution to the greenhouse effect than carbon
dioxide.
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(ii) Suggest a reason why more attempts are being made to limit the release of carbon dioxide into the
atmosphere than the release of water vapour.
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 (iii) Describe two ways that humans can limit the release of carbon dioxide into the atmosphere.
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(c) Describe two effects that global warming could have on an animal's habitat.
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(Total for question = 9 marks)