Of all the appliances I use on a daily basis...
...my smartphone is probably the least demanding in terms of energy consumption. I'm certain the 40-year-old flip-style clock radio that I keep on my desk here uses far more power. I recently purchased and installed a 70" LED TV for one of my charities. It will consume less power than the 30-gallon aquarium in my office.
In fact, energy consumption per-American has been on the decline for several decades now. Yes, when considered in aggregate, electronics today do consume a significant amount of energy. But no where near as much as other aspects of our national consumption used to. In environmental terms, think it's been a pretty good trade.
So let's go ahead and discuss the social aspects of this new tech - it's a very worthy topic. But throwing CO2 into the mix is not only non sequitur, it's just silly.