This topic summary covers Knowledge Organiser: Life Cycle Assessment within Life Cycle Assessment for GCSE Chemistry. Revise Life Cycle Assessment in Using Resources for GCSE Chemistry with 22 exam-style questions and 12 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 17 of 17 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Knowledge Organiser: Life Cycle Assessment
Key Terms
- LCA: Systematic evaluation of total environmental impact across all stages of a product's life
- Cradle to grave: From raw material extraction (birth) to final disposal (end of life)
- Cradle to cradle: Circular version — end of life becomes raw material for a new product
- Carbon footprint: Total greenhouse gas emissions across the entire lifecycle
Must-Know Facts
- 4 stages: Raw materials → Manufacturing → Use → End of life
- Smartphone: 85% of environmental impact is in raw material extraction
- LCA limitations: data quality, commercial bias, subjective comparisons, boundary problems
- LCA considers: energy, carbon footprint, water use, toxicity, land use, waste
- Companies may manipulate LCA results — this is called greenwashing
- Used for product comparison, sustainable design, and policy development
Key Equations
- No calculation equations — evaluative/analytical topic
- LCA 4 stages: Raw materials → Manufacturing → Use → End of life (disposal/recycling)
- Carbon footprint = total greenhouse gas emissions across all lifecycle stages
Common Mistakes
- Saying LCA is always objective: LCA can be manipulated — companies may select data that makes their product look better (greenwashing); results can be subjective depending on what is measured
- Forgetting all 4 stages of LCA: LCA must consider ALL stages — raw material extraction, manufacturing, use, AND end of life — missing any stage gives an incomplete picture
- Saying a product with a lower LCA score is always better: LCA results depend on which environmental factors are weighted — one product may have lower carbon footprint but higher water use
- Confusing LCA with recycling rates: LCA covers the entire lifecycle including recycling at the end — it is a broader assessment than just whether a material can be recycled
Practice questions for Life Cycle Assessment
What does LCA stand for in the context of environmental science?
State two factors that are measured during a life cycle assessment.
Quick recall flashcards
What are the four main stages of an LCA?
1. Raw material extraction 2. Manufacturing/Production 3. Use phase 4. End of life/Disposal
What does LCA stand for and what is its purpose?
Life Cycle Assessment - a method to evaluate the environmental impact of a product throughout its entire life from raw materials to disposal ('cradle to grave')