Human Impact on the Environment

Which of the causes of climate change below are naturally occurring?

• Changes in the Earth's axis

• Changes in the amount of energy released by the sun

• Volcanic eruptions

• Clearing of land for agriculture

• The Industrial Revolution

Which of the causes of climate change below are a result of human activity?

• The Industrial Revolution

• Cutting down trees for fuel and timber

• Changes in Earth's orbit around the sun

• Changes in ocean currents

• Volcanic Eruptions

Consequences of Climate Change include:

• More extreme weather

• Lowering of sea levels

• Increased risk of crop failure

• Desertification

Which of these actions would help to reduce greenhouse gas emissions?

• Changing to renewable forms of energy

• Decreasing water usage

• Increasing genetic variation of crops

• Increasing public transport usage

• Increasing solid waste disposal

A measure of the total greenhouse gas emissions caused by a country, organisation, or person in one year is called their:

The legal act that recognises the importance of having enough water for aquatic ecosystems such as rivers and wetlands is called the _____________ _____________ ____ of 1998.

Ethical ways to meet our water needs in the future include:

• Desalination of seawater

• Re-using and recycling of water

• Fixing leaks to reduce wastage

• Decreasing the cost of water for everyone

• Reducing the supply of water to homes

Water quality properties do NOT include:

• The physical water quality, for example the pH levels

• The chemical water quality, for example the calcium content

• The microbiological water quality, for example the levels of micro-organisms

• The aesthetic water quality, for example the odour

• The inorganic water quality, for example the chemical makeup

Which of these methods will NOT improve the water quality?

• Water purification

• Reducing water pollution

• Controlling alien invasive plants

• Reducing water consumption

What effect will climate change have on South Africa's food security?

• It will increase food security

• It will decrease food security

• It will have no effect on food security