The page linked by the HN post title (https://docs.stepci.com/guides/co2-testing.html) says:
> The calculation algorithm is provided by Sustainable Web Design
And links to: https://sustainablewebdesign.org/calculating-digital-emissio...
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That page:
> NOTE: This page is regularly updated to include the most recent research and information.
Also, the same page:
> Last update: April 17, 2022.
Call me naive but I was hoping research in this area will be faster/more frequent, given also the Cop27.