Lesson Notes By Weeks and Term v5 - Grade 9

Lesson Video

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Performance objectives

• Define sustainable technological development.
• Analyze environmental impacts of technology.
• Evaluate social impacts of technology.
• Propose sustainable solutions.
• Differentiate renewable and non-renewable resources.

Lesson summary

This week, we delve into the crucial relationship between technology, society, and the environment, specifically focusing on sustainable technological development and its impact. This isn't just an abstract concept; it directly impacts our daily lives in South Africa. From the water we drink to the air we breathe and the resources we use, technology plays a significant role. Understanding this relationship allows us to make informed choices and contribute to a more sustainable future for ourselves and generations to come. Consider the energy crisis South Africa is currently experiencing; understanding sustainable energy technologies and their societal impact is vital for finding solutions.

Lesson notes

2.1 What is Sustainable Technological Development? Sustainable Technological Development (STD) is the process of creating technological solutions that meet the needs of the present without compromising the ability of future generations to meet their own needs. It focuses on developing technologies that are environmentally friendly, socially responsible, and economically viable. It's not just about making things "green," but about considering the entire lifecycle of a technology, from resource extraction to production, use, and disposal. In a South African context, this means: Developing technologies that address specific local challenges such as water scarcity, energy poverty, and unemployment. Considering the impact of technology on vulnerable communities and ensuring that technological development benefits all members of society. Protecting our rich biodiversity and natural resources while promoting economic growth. 2.2 Environmental Impacts of Technology Technology can have both positive and negative impacts on the environment.

Negative Impacts: These can include pollution (air, water, soil), resource depletion (mining, deforestation), habitat destruction, and climate change. For example, coal-fired power plants, while providing electricity, contribute significantly to air pollution and greenhouse gas emissions. Mining activities in South Africa can lead to soil erosion, water contamination, and habitat loss. Improper disposal of electronic waste (e-waste) contaminates the soil with toxic heavy metals.

Positive Impacts: Technology can also be used to protect and restore the environment. Examples include renewable energy technologies (solar, wind, hydro), water purification systems, pollution control technologies, and precision agriculture (which uses technology to reduce water and fertilizer use). For instance, using solar panels to power homes in rural areas reduces reliance on fossil fuels and lowers carbon emissions. 2.3 Social Impacts of Technology Technology also has a profound impact on society.

Positive Impacts: These can include improved access to information and education, increased efficiency and productivity, job creation, and improved healthcare. For example, mobile technology has revolutionized access to information and communication in South Africa, especially in rural areas. Online education platforms are expanding access to quality education.

Negative Impacts: These can include job displacement (automation), increased inequality (digital divide), privacy concerns, and the erosion of traditional cultures. For example, automation in the mining industry can lead to job losses for unskilled workers. The digital divide can exacerbate existing inequalities, as access to technology and digital skills are not evenly distributed across society. 2.4 Renewable vs. Non-Renewable Resources A crucial aspect of sustainable technology is understanding the difference between renewable and non-renewable resources.

Renewable Resources: These are resources that can be replenished naturally over time. Examples include solar energy, wind energy, hydropower, geothermal energy, and biomass. Using renewable resources is essential for long-term sustainability.

Non-Renewable Resources: These are resources that exist in finite quantities and cannot be replenished on a human timescale. Examples include fossil fuels (coal, oil, natural gas) and minerals. Reliance on non-renewable resources is unsustainable in the long run, as these resources will eventually be depleted. 2.5 The Circular Economy The circular economy is an economic system aimed at eliminating waste and pollution, circulating products and materials (at their highest value), and regenerating nature. Instead of the traditional linear "take-make-dispose" model, the circular economy focuses on reducing, reusing, and recycling materials. Examples of circular economy principles in action include: Product design for durability and repairability: Designing products that last longer and can be easily repaired extends their lifespan and reduces waste.

Material recycling and upcycling: Recycling materials into new products reduces the need for virgin resources. Upcycling involves transforming waste materials into higher-value products.

Sharing economy: Sharing services and products (e.g., car sharing, tool libraries) reduces the overall demand for new products. 2.6 Worked Examples Example 1: Environmental Impact of Cell Phones Cell phones are ubiquitous in South Africa.

However, their production requires the extraction of rare earth minerals, which can have devastating environmental consequences (deforestation, water pollution). The manufacturing process also consumes significant energy and generates greenhouse gas emissions.

Furthermore, the improper disposal of old cell phones leads to e-waste pollution.