Summary
Evaluates the environmental impacts of a product from raw materials to disposal.
In depth
Stages: goal definition, inventory, impact assessment and interpretation. Compares cradle-to-grave impacts of products such as plastic versus glass bottles. Results depend on assumptions.
LCA includes energy, water, emissions and waste. System boundaries influence results. It supports design for sustainability.
Key idea: look at the whole life of a product, not only use.
Life cycle assessment (LCA) is a standardised method (ISO 14040) for evaluating a product's environmental impacts across its full life: raw material extraction, manufacture, transport, use, and end-of-life disposal or recycling, often called cradle to grave.
The four stages are defining goal and scope, inventorying inputs and outputs, assessing impacts (climate change, acidification, water use, toxicity, land use) and interpreting results. LCA can overturn assumptions: a reusable cup beats a disposable one only after being used enough times. Results depend on boundaries and data quality.
Example: comparing paper and plastic bags.
Frequently asked questions
What is Life Cycle Assessment?
Evaluates the environmental impacts of a product from raw materials to disposal.
Which area of biology covers Life Cycle Assessment, and how advanced is it?
Life Cycle Assessment is one of the 54 topics in Marine & Environmental Biology. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Renewable Energy, Recycling and Waste, Global Warming.
Why does Life Cycle Assessment matter?
It helps avoid shifting a problem from one stage or impact category to another.
Can you give an example of Life Cycle Assessment?
LCA showed reusable bags must be used multiple times to beat single-use ones.
What should I learn before Life Cycle Assessment?
Work through the Beginner topics in Marine & Environmental Biology first, such as Oceans, Ocean Zones, Plankton, then return to Life Cycle Assessment. Advanced topics assume the Intermediate vocabulary.
What topics are related to Life Cycle Assessment?
The closest topics to Life Cycle Assessment are Renewable Energy, Recycling and Waste, Global Warming, Permafrost and Methane. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Life Cycle Assessment?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Life Cycle Assessment. To practise the whole of Marine & Environmental Biology, use the Marine & Environmental Biology quiz.
How is Life Cycle Assessment different from Renewable Energy?
Life Cycle Assessment: Evaluates the environmental impacts of a product from raw materials to disposal. Renewable Energy: Sources like solar, wind and hydro that replenish naturally and cause less pollution. Read both side by side and note what each one explains.
How should I study Life Cycle Assessment step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Renewable Energy and explain the difference aloud. Finally, take the Marine & Environmental Biology quiz and come back to this page for any question you miss.