Life Cycle Assessments (LCAs)

What is the purpose of Life Cycle Assessments (LCAs)?

• To determine the cost-effectiveness of a product

• To assess the environmental impact of products at different stages

• To evaluate the durability of a product

• To calculate the energy consumption of a product only

Which of the following is NOT a stage considered in Life Cycle Assessments (LCAs)?

• Manufacturing and packaging

• Disposal at the end of its useful life

• Marketing and sales strategies

• Use and operation during its lifetime

Why is Life Cycle Assessment (LCA) not considered a purely objective process?

• Because it only considers the use of raw materials

• Because it is too complex to carry out

• Because it requires value judgements when allocating numerical values to pollutant effects

• Because it does not consider the use of water and energy

Which of the following factors is NOT considered in an LCA?

• Use of energy at all stages

• Use of water at all stages

• Color and design of the product

• Transportation and distribution at all stages

What can students learn to do regarding LCAs according to the text?

• Predict the future impact of products on the environment

• Carry out simple comparative LCAs for shopping bags made from different materials

• Perform full LCAs for complex industrial products

• Use LCAs to support claims for advertising purposes

What is the raw material used to make a plastic bag according to the Life Cycle Assessment (LCA) in Table 1?

• Wood

• Crude oil or natural gas

• Atmospheric emissions

• Waterborne wastes

According to Table 1, how much CO₂ is produced in the manufacturing of a paper bag?

• 0.23 kg

• 14 g

• 0.53 kg

• 1.7 MJ

Which bag requires more energy for its production according to the data in Table 1?

• Plastic bag

• Paper bag

• Both require the same amount of energy

• The table does not provide this information

How much more volume of fresh water is used in the production of a paper bag compared to a plastic bag, based on Table 1?

• 4,265 dm³

• 255 dm³

• 4,520 dm³

• 50 g

What is the purpose of the diagram labeled "Figure 2" in the image?

• To show the process of recycling plastic bags

• To show the inputs and outputs in a Life Cycle Assessment

• To compare the environmental impact of plastic and paper bags

• To illustrate the manufacturing process of ethene