<aside> đź’ˇ The following Q&A offers responses to frequently asked questions about emissions calculations with Lune. Please feel free to share these responses internally and externally as you see fit.

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Summary

Lune helps you estimate the carbon emissions of a purchase at time of transaction, based on product category and monetary value of product. Our calculations are based on the leading international standard for emissions calculations, the GHG Protocol, and have been audited and are ISO-certified (ISO 14064). On top of that, we may apply industry-specific methodologies to increase accuracy, such as ICAO for flights or GLEC for logistics

What are carbon emissions calculations?

Carbon emissions calculations are the process of quantifying the amount of greenhouse gases (GHGs) released into the atmosphere as a result of human activities, such as purchases, transportation and logistics. These calculations help businesses and individuals understand their carbon footprint and take steps to reduce their environmental impact.

What is the unit of the calculations?

The unit of the calculations is tCO2e, which stands for metric tonnes of carbon dioxide equivalent. This unit is used to express the amount of greenhouse gases emitted in a way that standardises the impact of different gases, such as methane and nitrous oxide, in terms of the amount of CO2 that would have the same global warming potential.

tCO2e helps to simplify the comparison and aggregation of emissions data across various activities and sources. For smaller amounts of emissions, the unit can also be expressed in grams (gCO2e) or kilograms (kgCO2e).

How does Lune calculate emissions for purchases?

Lune uses the GHG Protocol’s Spend-Based Method to calculate emissions.

We use 3 inputs to calculate emissions:

  1. Product category
  2. Monetary value of purchase
  3. Country

Optional inputs include dietary preferences. Users can also be prompted to input travel details, to use mileage specific calculations instead.

Lune uses several thousands of spend-based emissions factors, with global coverage and country-specific data 45+ countries.

Read more about our methodology

How does Lune calculate emissions for travel**?**

Following the GHG Protocol guidelines, Lune calculates emissions for passenger cars, rail, and air transport.