Lesson Notes By Weeks and Term v5 - Grade 12

Lesson Video

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Performance objectives

• Describe causes and consequences of pollution in South Africa.
• Explain biodiversity loss using South African examples.
• Discuss impacts of deforestation, desertification, and climate change.
• Evaluate conservation strategies in South Africa.
• Apply knowledge to interpret environmental data.

Lesson summary

The environment is under increasing pressure from human activities. This topic explores the profound ways in which our actions are shaping, and often damaging, the natural world. Understanding these impacts is crucial for creating a sustainable future for South Africa and the planet. South Africa, with its rich biodiversity and socio-economic challenges, is particularly vulnerable to environmental degradation. From water scarcity in the Western Cape to air pollution in industrial areas, the impacts are already being felt. Learning about these challenges equips you with the knowledge to make informed decisions and contribute to solutions.

Lesson notes

2.1 Pollution Pollution is the introduction of contaminants into the natural environment that cause instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms.

Types of pollution include: Air Pollution: This occurs when harmful substances like particulate matter, nitrogen oxides, sulfur dioxide, and carbon monoxide are released into the atmosphere.

Causes: Burning of fossil fuels (coal, oil, gas) in power plants and vehicles, industrial processes, mining activities, and household fuel burning (e.g., paraffin stoves, wood fires). In South Africa, coal-fired power plants are a major source of air pollution, particularly in the Highveld region.

Consequences: Respiratory problems (asthma, bronchitis), cardiovascular diseases, acid rain (damaging buildings and ecosystems), smog (reducing visibility), and climate change. The Vaal Triangle and the Highveld are notorious for high levels of air pollution, leading to increased health problems in these areas.