8x $small_num is still very little.

I prefer low definition for other reasons and will therefore do this anyway, but saving the environment (or improving any other metric) is function of cost and benefit — while switching to SD is low cost (in my case negative cost) it is also not beneficial enough to make a noticeable dent in annual emissions, given the more detailed estimates for energy cost in the following article:

https://www.carbonbrief.org/factcheck-what-is-the-carbon-foo...