I think the main problem is that most computation happens at the user's browser - the different types of hosting will barely play a role in the overall footprin

I think the main problem is that most computation happens at the user's browser - the different types of hosting will barely play a role in the overall footprint of a website. Edit: For an example, look at the app store for the oculus quest: https://www.oculus.com/experiences/quest/ https://www.oculus.com/experiences/quest/ - That site is ridiculously slow for what it actually does: Static text + images. And the current state already is way better than before! Almost all content is either static (the apps) or cachable (the ratings). There are barely 100 apps in the store, so this isn't exactly a case where there have to be hot updates every few seconds. This should be rendered server-side, cached, and then sent to the users as static html. The world could save literally tons of CO2 with proper design here.