Carbon dioxide and global warming: the greenhouse effect
2 marks · NormalState two environmental effects that rising levels of carbon dioxide in the atmosphere may cause.
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Also accept: Flooding; Melting of glaciers/ice caps; Droughts; Heatwaves; More storms
Common mistakes: Only stating global warming without stating an effect; Giving effects unrelated to carbon dioxide increase
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Marking points
B1 · 1 mark · One correct environmental effect of CO2 rise stated.
B2 · 1 mark · A second, different effect stated.
Worked solution
Rising carbon dioxide levels may cause the polar ice caps to melt and sea levels to rise.