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Specifically:
- **Datacenter and technical environment**: are calculated as defined in the global calculation methodology, and allocated according to the underlying instances.
- **Network impact**: Allocated proportionally based on the underlying instances’ network usage.
- **Customer servers**: Impact is calculated using the same method as for Bare Metal servers, but allocated according to instance usage.
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Suggested change
- **Customer servers**: Impact is calculated using the same method as for Bare Metal servers, but allocated according to instance usage.
- **Customer servers**: Impact is calculated using the same method as for [Instances](/environmental-footprint/additional-content/instances-env-footprint/), and allocated according to instance usage.

Assume a Load Balancer runs on an underlying Instance with:
- **Power consumption:** 110 W (0.110 kW)
- **Usage duration:** 100 hours
- **Allocation ratio** (based on instance share): `lb_ratio = 0.5`
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En réalité pour load balancer il n'y a pas "d'allocation ratio", un lb utilise une instance donc on peut supprimer cette ligne

UsageFootprint = 0.110 * 100 * 0.065 * 1.16 = 0.825 kgCO2e
```

**Manufacturing Impact** (6-year lifespan = 52,560 hours, manufacturing impact = 850 kgCO2e):
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je préciserai que le manufacturing impact de 850kg est une valeur fictive a titre d'exemple


**Energy Usage Impact**:
```math
UsageFootprint = 0.110 * 100 * 0.065 * 1.16 = 0.825 kgCO2e
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je rajouterai le 0,065 et le 1,16 dans la liste des valeurs mentionné au dessus afin que ce soit plus claire. Il faudra indiquer que ce sont des valeurs fictive, a titre d'exemple, comme ca si les vrai valeur évoluent, on n'aura pas besoin de modifier ici

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