参考答案:
One mark for each global warming (cause), one mark for its positive feedback (effect)
Three pairs of cause and effect, to get 6 marks.
C1 Global warming leads to the melting of polar ice.
E1 Less polar ice results in the reduction of reflection from ice, so more heat is absorbed.
C2 Increased amount of water vapour in the atmosphere.
E2 Water vapour is a greenhouse gas/retains heat in the atmosphere.
C3 More permafrost melting.
E3 (permafrost melting) releases methane into the atmosphere increasing global warming.
C4 Warming leads to an increased release of carbon dioxide from deep ocean.
E4 Increase of carbon dioxide in the atmosphere.
C5 Increase in drought/forest fires.
E5 Increase of carbon dioxide in the atmosphere.
C6 Accelerating rate of decomposition of organic matter producing methane.
E6 Releases methane into the atmosphere
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