Topic 11.2: Life-cycle analysis Questions

A proposed storage tray uses offcuts from an existing timber process, accurate cutting that reduces rework, and screwed parts suitable for reuse. Explain how these features could reduce energy requirements in pre-production, production and disposal.

State what 'cradle to grave' means.

Give two inputs and two outputs recorded at the manufacturing stage of a life cycle assessment.

Outline one environmental effect of dyeing fabric for curtains.

Draw a diagram naming the five stages of a life cycle assessment in order.

Outline how a reusable-cup producer could use LCA to identify where to reduce waste.

Outline how LCA could guide waste reduction for a replacement bicycle light.

Outline how a furniture maker could use LCA before changing its chair packaging.

Two lamp designs differ in materials and electricity use. Which approach compares their whole-life environmental effects?

Why is global warming potential expressed in CO₂ equivalent?

State two of the five stages considered in a life cycle assessment.

State what a life cycle assessment measures.

Explain the cradle-to-grave life cycle of a domestic refrigerator, and say which stage a designer should attack.

A washing-machine panel uses separable, labelled steel. Explain how that choice can reduce its disposal-stage impact.

A garden lantern body uses separable, labelled aluminium. Explain how that choice can reduce its disposal-stage impact.

A bicycle basket uses separable, labelled steel. Explain how that choice can reduce its disposal-stage impact.

State which LCA stage is extended by repairing a torn seam in a raincoat.

State which LCA stage is extended by replacing its failed switch in a desk lamp.

State which LCA stage is extended by replacing a broken wheel in a suitcase.

An illustrative LCA compares a meal container designs for the same service. Disposal emissions are 24 kg CO₂e for the old design and 6 kg CO₂e for the new one. Calculate the percentage reduction.