Causes of Climate Change

Which is a Human cause of climate change?

• Melting permafrost

• Deforestation

• Volcanic eruptions

• Solar radiation

Fill in the blank: Water vapour is the most important greenhouse gas. It accounts for almost ___% of the naturally occurring effect.

• 98

• 75

• 85

• 90

Which gas contributes 19% to the enhanced greenhouse effect?

• Carbon dioxide

• Methane

• CFCs

• Nitrous oxide

What is the percentage contribution of nitrous oxide to the enhanced greenhouse effect?

• 64%

• 19%

• 11%

• 6%

Explain the impact of deforestation on carbon dioxide levels as described in the passage.

• Deforestation increases carbon dioxide levels by reducing the number of trees that absorb CO2.

• Deforestation decreases carbon dioxide levels by increasing the number of trees that absorb CO2.

• Deforestation has no impact on carbon dioxide levels.

• Deforestation increases oxygen levels instead of carbon dioxide.

What are CFCs released from when not disposed of correctly?

• Aerosol spray cans

• Air conditioning units and refrigerators

• Industrial waste

• Natural sources

The effect of CFCs is:

• Depletion of the ozone layer

• Increase in ozone layer thickness

• No effect on the ozone layer

• Formation of new ozone molecules

Nitrous oxides are released from which of the following sources?

• Automobiles

• Industrial processes

• Agricultural activities

• All of the above

What is one of the major developments in the world that good geographers will connect to rising levels of greenhouse emissions?

• Rapid population growth in the 20th Century

• Increasing technology linked to the use of natural resources

• Development across the developing world

Human activity contributes to the enhanced greenhouse effect by:

• Increasing the concentration of greenhouse gases in the atmosphere

• Decreasing the concentration of greenhouse gases in the atmosphere

• Having no impact on the concentration of greenhouse gases

• Reducing the Earth's natural greenhouse effect