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Data centers are ridiculously efficient. The latest generation of data centers from the big cloud providers have PUE in 1.07 territory, which would've seemed like pie-in-the-sky ludicrousness even 10 years ago. Every CPU cycle that's done in a data center instead of on someone's client machine or on-prem server is a decrease in power consumption.

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Do you know what is the global consumption of energy of data centers in 2016 ? It is same as consumption of energy of global aviation. Think about it, the energy consumed by Data Centers is equal to all commerical planes world wide flying. (source: realclearnergy podcast)

They may very well be efficient, that is shit load of energy and that is point.