Did you read the article? "Imagine you've got a shiny computer that is identical to a Macbook Air, except that it has the energy efficiency of a machine from 2

Did you read the article? "Imagine you've got a shiny computer that is identical to a Macbook Air, except that it has the energy efficiency of a machine from 20 years ago." It would take an awful lot of 1990's machines to equal the computing power of a macbook air.