Just some tangential food for thought: A few years ago Google did an Earth Day stunt where they set their homepage background color to black to symbolize saving

Just some tangential food for thought: A few years ago Google did an Earth Day stunt where they set their homepage background color to black to symbolize saving energy by remembering to turn out the lights. It was tongue-in-cheek, but I've been curious ever since if major websites making a conscientious change to reduce JS execution and transfer bandwidth would have a measurable impact on worldwide power consumption. Kind of branches out to more questions like: how much energy is wasted running poorly optimized code (on the web and otherwise) where the same outcomes could be accomplished with code that executes fewer instructions? Should developers have an obligation or at least a conscience about writing performant code for the environment's sake? Would the impact even be measurable?