Has the environmental impact of less efficient processing been studied? I've been thinking about this since seeing those stories a while back about bitcoin mine

Has the environmental impact of less efficient processing been studied? I've been thinking about this since seeing those stories a while back about bitcoin miners collectively having the same power consumption as some smaller countries. If anyone knows a dataset suggesting what % of world energy usage is used by computing hardware (and what proportion of that hardware is idle vs fully utilised) I'd love to see it. Also, less on topic, what's the environmental impact of writing your app in something programmer friendly but power inefficient? I strongly suspect some big tech companies will be suffering with this (namely anyone who is still on RoR at scale).