Yes - 2 Community Groups (i.e. not formal W3C standardization groups) are exploring this space:
* https://www.w3.org/community/sustyweb/ developing guidelines for sustainable web design
* https://www.w3.org/community/sustainability/ taking a broader look at the question across W3C work
@laurenteskenazi @w3c @wai @webi18n @tag @ab