That one's covered in the article, wastes too much energy. I submitted this article yesterday and it went by with no upvotes because people probably thought it suggest we return to typewriters and paper piles, which it doesn't (I could've editorialised the title but guidelines say not to). It basically describes how energy inefficient today's offices are and how we can fix them.
Edit: Driving just one mile further to work is significantly more energy than a huge monitor and nobody thinks a 11 mile commute is vastly worse than a 10 mile one.
Modern monitors are very low energy usage. The lights above you likely use more power than two 27" LED monitors, especially as overhead lights are often on more than your ~25-50w monitors are. Note, monitor brightness does impact usage.
My main monitor at work is a 34" ultrawide, marginal increase in power consumption, but with Spectacles for OSX I'm able to use it as 2 monitors (I have secondary monitors but I hardly need to use them