CAIE IGCSE Biology 20.3.3 Methane & Carbon Dioxide Pollution

Practise linking human sources of methane and carbon dioxide to the enhanced greenhouse effect and climate change.

Exam points

identify cattle and rice farming as methane sources and combustion as a carbon dioxide source
state that methane and carbon dioxide absorb outgoing heat as greenhouse gases
link increased greenhouse-gas concentrations to the enhanced greenhouse effect and climate change

[Maximum number: 3]

Fig. 6.1 shows part of the carbon cycle in the ocean.

Fig. 6.1 (not to scale)

Describe the effect on the environment of additional carbon dioxide in the atmosphere.

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