While I understand and agree with you, the obvious counterargument is how many people get serviced and the generated value of them being served. I mean people won't argue that a car is better than a bus because the car produces less carbon. What I think is the better way to highlight the ridiculousness of those icons, a newspaper website produces more carbon (if energy source is producing carbon) than a server that just return the certification icon. So newspaper website is worse? That is how this certification works... Low information density gets rewarded. Which is contra productive if the goal is an energy efficient web.

To be fair, the service in the screenshot, tries to estimate the average carbon over the year and collects data to improve estimated that counter some of my critic, but it doesn't fix the ignorance to the kind of data provided and rewards low data density to some degree