This tool estimates transport-related emissions for dry ice biosample shipments versus an Atelerix ambient shipment scenario. It excludes packaging manufacture, storage energy, failed shipments, returns, disposal and full product lifecycle impacts.

• Core activity unit: tonne-kilometres = shipment weight in tonnes × route distance in kilometres.
• Dry ice production emissions are included at 2.0 kg CO₂e per kg dry ice. Sublimation is excluded by default.
• Dry ice mass is auto-estimated by route unless edited: 3 kg local/regional, 8 kg UK/domestic or European regional, and 20 kg long-haul international.
• The model uses two separate packed shipment masses: a higher dry ice shipment mass including dry ice and insulated packaging, and a lower Atelerix ambient shipment mass using a default 2 kg transport-box assumption.
• Cost estimates use the same two-mass logic: dry ice shipment cost scales with packed mass and dry ice handling, while Atelerix cost scales with the lower ambient shipment mass.
• Transport modes can be auto-selected by route or manually adjusted in advanced assumptions.
• Default air factor: 1.0 kg CO₂e per tonne-km, with a default 1.25 route uplift.
• Default road factor: 0.10 kg CO₂e per tonne-km, with a default 1.10 route uplift.
• Cost outputs are indicative only. The revised model ignores Medical Express premium pricing and instead uses a non-Medical Express comparison based on packed shipment mass, route band and service complexity.
• Domestic routes are treated as primarily carbon/workflow-led, European routes as moderate-saving, and international routes as more likely to show commercial benefit from the lower packed mass of an Atelerix ambient shipment.
• Negative cost outputs are not presented as definitive losses. They are treated as workflow-dependent because real commercial impact depends on route, service level, shipment consolidation and workflow configuration.