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B3 Life on Earth

B3 Life on Earth. Lesson 12: Thinking Ahead. Objectives. MUST understand that scientific advances can make life better, but can also have unforeseen consequences SHOULD explain the factors that determine the sustainability of a product or process. Key Words.

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B3 Life on Earth

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  1. B3 Life on Earth Lesson 12: Thinking Ahead

  2. Objectives • MUSTunderstand that scientific advances can make life better, but can also have unforeseen consequences • SHOULD explain the factors that determine the sustainability of a product or process

  3. Key Words • You need to be able to define the following: • Life Cycle Assessment • Biodegradable

  4. Textbook Answers 1) They can be expensive; use a lot of energy to produce and transport; take a long time to degrade. 2) They do not cause waste like disposable nappies do; but energy is used in washing and drying these nappies. 3) Leaves the environment unharmed and able to provide that product again in the future. 4) When produce is bought and sold at a farmers’ market, the costs, energy and pollution created by transporting that product to a supermarket and then back to a person’s home are minimised.

  5. Textbook Answers 5) The Life Cycle Assessment should include the raw materials used; the chemicals applied to the crop; the fuel used in maintaining and harvesting the crop and then getting it to the processing plant; the energy and pollution caused through the processing and packaging; the air transport to the UK and road transport to the supermarket and then to the consumer’s home. 6) It is probably not sustainable; drinking English apple juice would be much more sustainable; more sustainable still would be growing your own fruit and squeezing it for juice.

  6. Worksheet Answers Activity 1 (Low demand) • resources; generations; sustainability; energy; packaged; pollution. Activity 3 (High demand) • Natural materials are most sustainable; minimally processed materials (such as paper) are less sustainable than natural materials, but still preferable to plastics. • Suppliers should let customers know which parts of the packaging are made from recycled materials and how they can be recycled after use. • The minimum amount of packaging that keeps the product in a good condition should be used.

  7. Worksheet Answers Activity 2 (Standard demand) 1) Prairie dogs maintain grassland by fertilising and aerating the soil; the holes they make provide valuable nesting habitats for other species. 2) Tiger sharks keep the numbers of grazing turtles and dugong down; if the shark population declines, the sea-grass beds are over-grazed; these beds are where the fish lay their eggs, so this leads to limited egg-laying sites and so rapid decline in fish populations. 3) African elephants weed out and eat young trees and shrubs in the grassland; if these were allowed to grow the grassland would become wooded; herds of grazing animals such as impala would disappear; and also the carnivores such as lions that prey on them.

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