Scope 3 — the emissions across your value chain — is usually the largest part of a company’s footprint and the part that sends people into a spin. The instinct is to measure everything to three decimal places. That is exactly the wrong instinct.
Start by mapping the fifteen Scope 3 categories against your actual business and asking a blunt question of each: could this plausibly be material, and would knowing the number change a decision? For most companies, two or three categories dominate — purchased goods, transport, perhaps the use of sold products — and the rest are rounding error.
Concentrate your effort where the tonnes are. A rough but defensible number for a big category beats a precise number for a trivial one. Document your assumptions and your data sources so the figure can be improved next year rather than rebuilt from nothing.
Scope 3 is a multi-year discipline, not a one-off project. The goal of your first pass is a credible estimate and a clear view of where the real emissions sit — that alone tells you where reductions are worth chasing.
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