It'd be crazy to think about the energy spent over time on building just chrome - turn that into a carbon footprint and itd be shocking! I always try to write code for humans and not over-engineer or prematurely optimize code, but sometimes I wonder about a section of code over the long term - that bit of javascript thats going to be run on lots of phones and other devices over years or decades - and how much electricity its going to cost more just because I used `map` instead of a `for` loop... I can't imagine working with a build process that takes that long to run.