Estimate how much carbon is prevented by repairing instead of replacing. Use embodied emission factors from credible lifecycle databases or UK government greenhouse gas conversion factors, adjusted for product categories. Multiply by probability of avoided replacement and years of extended life. State uncertainty ranges clearly, preferring conservative estimates that retain stakeholder confidence.
Measure the mass of items kept in use to quantify waste avoided. When precise weights are impractical, sample and extrapolate carefully across common categories like small appliances, textiles, and furniture. Track parts replaced to reflect partial material inputs, preventing inflated savings and presenting a balanced picture of genuinely avoided disposal impacts.
Where robust data exist, apply water and energy intensity values for typical products, acknowledging wider uncertainty. Consider usage-phase savings only when repair improves efficiency, such as fixing seals on fridges or restoring insulation. Avoid speculative estimates, document sources, and invite peer feedback to refine methods as better UK-specific datasets emerge.
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