Which of the following activities had altered the quantity of greenhouse gases?

• Population growth

• Modern industrialisation

• Consumption of meat

• Reforestation

Each of the last decade has been successively warmer than any other preceding decade since ____.

The rapid increase in greenhouse gases through the burning of fossil fuels and changing land use has led to the ________________________.

_____________ causes refers to factors relating to, or resulting from the actions of people.

The process in which carbon (in soil) reacts with oxygen to produce carbon dioxide is called ______ _________.

Which of the following is/are example(s) of fossil fuels?

• Natural gas

• Coal

• Oil

• Nuclear power

How does deforestation contribute to the enhanced greenhouse effect?

• Reduces the number of trees that absorb carbon dioxide through photosynthesis

• Stored carbon in trees is released back into the atmosphere as carbon dioxide

• Clearing of trees exposes the soil beneath to sunlight, which increases soil temperature and the rate of carbon oxidation

• The fallen trees will decrease albedo and cause more reflection of incoming solar radiation

How does agriculture contribute to the enhanced greenhouse effect?

• Nitrogen in chemical fertilisers converts to nitrous oxide

• Burning of fossil fuels to produce energy for farm machinery

• Irrigation flushes the carbon out of the soil and into the atmosphere

• Livestock rearing and natural decomposition processes release methane

How does industries contribute to the enhanced greenhouse effect?

• Fossil fuels are burned to generate energy to run the machinery and other factory processes.

• Machineries emit waste heat when in use

• Industries do not contribute to the enhanced greenhouse effect

• Workers at the industries go on strike

How does urbanisation contribute to the enhanced greenhouse effect?

• Fossil fuels are burned to power the high concentration of vehicles

• Households consume energy for heating, cooling and lighting

• Residents have rooftop gardening to tap on the natural sunlight

• Roads and concrete reflect more incoming solar radiation due to darker surface