<aside> 💡 Estimating the carbon emissions of a purchase at time of transaction, based on product category average emission factors and monetary value of product. Our calculations are based on the leading international standard for emissions calculations, the GHG Protocol. On top of that, we may apply industry-specific methodologies to increase accuracy, such as ICAO for flights or GLEC for logistics.
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Lune uses the Greenhouse Gas Protocol’s Spend-Based Method to calculate emissions.
The GHG Protocol documents the following method for calculating emissions based on spending:
Spend-based method – ****estimates emissions for goods and services by collecting data on the economic value of goods and services purchased and multiplying it by relevant secondary (e.g., industry average) emission factors (e.g., average emissions per monetary value of goods).
and then
If the supplier-specific method, hybrid method, and average-data method are not feasible (e.g., due to data limitations), companies should apply the average spend-based method by collecting data on the economic value of purchased goods and services and multiplying them by the relevant EEIO emission factors. Refer to the “Secondary data sources” in the Introduction for further guidance on EEIO data.
We have two ways of calculating emissions:
See our API documentation for technical details.
Using the merchant category codes we can use a structured, universal format of inputing data for emissions calculations.
(required)(required)(required)(optional)(optional)Enter search word in free text form and we use search to match it to emission factors in our database. This adds flexibility to the MCC method but also increases the number of product categories covered by approx 10x. Example inputs: computer, cheese, plastic pipes.