# Methodology Overview | Embodied Emissions methodology
Source: https://greenpixie.com/docs/methodology/cloud-embodied-emissions/methodology-overview

How the methodology works at a high level.

Greenpixie's cloud embodied emissions methodology estimates the manufacturing, transport, and end-of-life emissions of the hardware attributable to public cloud workloads, for each unit of cloud usage.

A server's manufacturing emissions are built up one component at a time. The manufacturing emissions of a silicon die depend on its area and the process node it is fabricated on. For memory modules and solid state drives, capacity converts to die area at the die density of that generation. That area is then multiplied by the emissions of manufacturing a unit of die area in that generation. Mechanical drives and the fixed server components take fixed values per unit, adapted from published life cycle assessments and inventories.

Transport and end-of-life allowances are calculated as a percentage of the component manufacturing total, at rates set for each type of hardware.

That server total is divided across the operating hours of the lifetime the hardware is assumed to have, and across the capacity it presents. This gives a rate for each unit of capacity for each hour. An instance takes that rate for the capacity it occupies over the duration it is billed for. Greenpixie then adds an allowance for the data centre shell to the embodied emissions of each unit of cloud usage.

The methodology operates through eight parts, being silicon die coefficient, processor emissions, accelerator emissions, memory emissions, drive emissions, fixed server component emissions, transport and end-of-life allowances, and amortisation and apportionment. Section 7 describes each in detail. Together they produce the embodied emissions figure for each unit of cloud usage.