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== Calculation ==
 
== Calculation ==
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What do we want to calculate? Just the distances? Or also the CO<sub>2</sub>-impact?
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What distances do we take? By road? By boat? Or a mix? And if both are possible, when do we use one or the other?
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If we calculate the CO<sub>Subscript text</sub>2-impact we need to make additional assumptions.
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For the purpose of emphasising the (total) distance traveled by product and its ingredients, we should stay with the distances. We can use a 2000 km cutoff limit for transport by road, below we use road, above we use boat.
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=== Formula ===
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Distance<sub>total</sub> = Distance<sub>ingredients</sub> + Distance<sub>wholesale</sub> + Distance<sub>distribution</sub>
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The total distance formula consists of three parts:
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* ingredients: the transportation of the ingredients to the production site;
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* wholesale: the transportation of the finished product to the seller;
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* distribution: the transportation from the reseller to the consumer;
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