I don't feel like I'm asking that much but for some reason websites insist on using HD videos as site background, autoplaying livestreams, newsletter popups and more.
No need to argue about saving the climate - not using Netflix or YouTube would indeed make a much larger difference - but just do it for our sanity. I swear the only reason I'm not clinically insane yet is because browsers have tabs which let me load websites in the background. And that's with an internet connection that, while not the fastest, is far beyond anything certain remote regions have access to.
How about we keep sites lightweight so more people around the world have access to information and education, in turn improving more than just the climate.