GCSE Combined Science revision · Chemistry: organic, analysis, atmosphere and resources
A life cycle assessment (LCA) judges the environmental impact of a product at each stage: extracting and processing raw materials, manufacturing and packaging, use and operation, and disposal. Some values, such as pollution effects, are hard to measure, so LCAs can be biased. Reusing and recycling metals, glass and plastics reduces the use of limited resources, energy use and waste.
Watch out A product with a lower manufacturing impact can still have a higher overall impact if it is used once and thrown away.
Give one reason why a life cycle assessment may be unreliable.
Answer Some impacts are hard to measure, so judgements can be biased
Which is a stage in a life cycle assessment?
Why is recycling metals beneficial?
A plastic bag's LCA lists energy use: materials 30 MJ, manufacture 10 MJ, use 0 MJ, disposal 2 MJ. What is the total energy in MJ?
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