(a) Figure 3 shows the symbol for carbon footprint. State four activities that can be related to carbon footprint.
Figure 3
(b) Figure 4 shows various types of environmental pollution.
Study the information in Figure 4 and answer the following questions.
(i) Identify a type of pollution that is related to energy.
(ii) Name the type of pollution related to eutrophication.
(iii) Give one example of harmful effect of air pollution.
(iv) State the common characteristics of the pollution types shown in Figure 4.
Answer:
(a) Transport, use of fuel, personal activity, release of greenhouse gases, recycling, use of electrical energy, water, gas, waste, carbon balance (any four)
(b)(i) Thermal pollution
(b)(ii) Water pollution
(b)(iii) Acid rain, global warming, climate change (any one)
(b)(iv) Physical, chemical or biological changes which jeopardize the environment
Air conditioners are electrical appliances that are widely used in our daily lives. Have you experienced the hot air emitted from the compressor of an air conditioner (Figure 5)?
Figure 5
(a) What is the type of environmental pollution caused by air conditioners?
(b) How can pollution caused by the usage of air conditioners be reduced?
(c) Suggest one creative way to use the heat released from the compressor of an air conditioner.
Answer:
(a) Thermal pollution
(b)
• Air conditioners should be turned on at temperatures of 22°C – 25°C.
• The inside and outside of air conditioners must be kept clean to increase energy efficiency.
(or any other suitable answer)
(c)
• To dry wet clothes
• To process food through drying or dehydrating such as dried shrimp
• To defrost frozen food or drinks
(any one)