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QUESTION 17 (5 marks) Explain how land clearing can influence climate change. Identify three subsequent impacts on Earth’s biosphere.
QUESTION 7 The graph shows total global carbon dioxide (GtCO ) emissions from burning fossil fuels and deforestation. 80 70 60 50 40 30 20 Global CO emissions (GtCO emissions) 10 0 SG & D HM GD OG - HF OH DB GHG WO FB HD © CS SSS MQ SG VV GON GV os 8 \y os \) S » os \) \N) a yr of Vy Year If the trend since 2000 continues GtCO emissions in 2030 will be approximately (A) 72 (B) 62 (C) 51 (D) 43
QUESTION 18 (6 marks) The graph shows the rate of carbon dioxide emissions and absorption between 1920 and 2020. Global CO (Gt) a) b) 50 40 30 20 10 0 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2020 Year Key — Emissions ---- Absorption Explain the net effect of the trends in carbon dioxide emissions shown by the graph. [2 marks] Suggest a likely cause of the trends identified in Question 18a). Explain the implications of the trends for the chemical composition of the atmosphere and the climate. Show your reasoning. [4 marks]
QUESTION 5 (11 marks) a) Explain the effect of land clearing on the composition of Earth’s atmosphere. [4 marks] Refer to Stimulus 5 in the stimulus book. b) Predict the impact on the composition of the atmosphere if the global methane budget stays the same. [4 marks] c) Draw aconclusion about the significance of anthropogenic contributions to the methane budget and the effect on global temperatures. Explain your reasoning. [3 marks]
QUESTION 5 Which of the following options lists primary greenhouse gases that are produced both naturally and through anthropogenic activities? (A) (B) (C) (D) carbon dioxide methane hydrofluorocarbons chlorofluorocarbons water vapour ozone carbon monoxide chlorofluorocarbons ozone hydrofluorocarbons nitrous oxide carbon monoxide water vapour methane carbon dioxide nitrous oxide
QUESTION 24 (10 marks) a) Using two examples explain how agricultural activity can have a positive and negative impact on the concentration of particulate materials in the atmosphere. [4 marks] b) Discuss the influence of natural and anthropogenic processes on the production of atmospheric carbon dioxide over time using two examples of each. [6 marks]
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