The concept of "greenness" in general is mostly a marketing feature, i.e. just another thing meant to entice you into a purchase instead of thinking about the big picture. If you're an IT director buying computers for a whole office, efficiency might make a big difference in the power budget for that building, but it's not going to have any measurable effect on the environment. The climate change problem is driven by aggregate effects; individual choices don't have much effect unless they represent a major trend in the population (unless the individual has authority over, say, how to build/run a coal-fired power plant).
I care about power consumption when building a PC, but it's mostly because I suppose that lower power consumption will generally mean higher reliability and lower fan noise.



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