The Bite-sized treatment from Reality Sandwich:

http://www.realitysandwich.com/peak_internet

The Hungry Man version from John Michael Greer:

https://www.blogger.com/comment.g?blogID=27481991&postID=4305837658375602312

It's not an accident that the internet came into existence during the last hurrah of the age of cheap energy, the quarter century between 1980 and 2005 when the price of energy dropped to the lowest levels in human history. Only in a period where energy was quite literally too cheap to bother conserving could so energy-intensive an information network be constructed. The problem here, of course, is that the conditions that made the cheap abundant energy of that quarter century have already come to an end, and the economics of the internet take on a very different shape as energy becomes scarce and expensive again.

-John Michael Greer

In both instances, some of the best stuff comes in the comments section.