Test sustainability claims with one service unit, life-cycle boundary and measured operating data.
First define a functional unit covering product, quantity, route and acceptance condition. Measure energy, washing, charging, returns, repair, loss and product outcome within one boundary from production through end of use. Report a conclusion only when comparative data support it, stating conditions and uncertainty.
A technology label alone does not establish sustainability.
Measure return, washing, charging, repair and loss within one life-cycle boundary.
Do not claim general environmental superiority without comparative data.
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