With reference to Fig. 7, describe the relationship between atmospheric carbon dioxide and global warming and their changes over the years. [4]
BEST ANSWER: Ahmad
- Global warming increases with increase in carbon dioxide/Global temperature has a direct relationship with carbon dioxide.
- During pre-industrial level, carbon dioxide increased gradually to 260ppm with only 1 degree celsius increase in atmospheric temperature.
- However during industrial period, carbon dioxide accounting for anthropogenic warming has increased rapidly. Carbon dioxide accounting for natural warming has remained constant.
- Therefore Carbon dioxide given out during industrialisation has resulted in a rapid increase of temperature of 6.5 degree celsius.
- never use data (or use wrong data)
- never describe what type of 'increase' - can use words like 'gradual increase', 'rapid increase', 'steady increase'
Explain how any three activities have brought about an increase in the greenhouse gases shown in Fig. 10. [3]
BEST ANSWER: Haikal, Ammar, Gigi
- The burning of fossil fuels for electricity during industrialization has increase the amount of carbon dioxide released to the atmosphere.
- During Deforestation whereby trees are being destroyed faster than the rate of growth, there is an increase in carbon dioxide level. This is because there are not enough trees to photosynthesize and take up carbon dioxide in the air.
- In agriculture, Cattle increases methane level due to the gas it releases.
Common mistake:
- Lump Deforestation and burning fossil fuel together
- Water vapour - leads to sea level rise (How does this links to greenhouse gas?
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