Did you know that by reading this you are contributing to climate change. Oops! Seriously, it is claimed that by 2025 the internet will use a fifth of the world’s electricity, assuming no massive increase in the use of electric transport. And before you decide to stop reading this to save the climate, apart from the use of your computer, you make no difference whether you read it or not. On the other hand, apparently Bitcoin mining consumes the total electricity consumption of Switzerland, so steady on there. The infrastructure for the internet is always on, and the messages you send make no difference. Sorry but you cannot save the world by not sending that email, and of course had you posted a physical letter, there would have been significant greenhouse gas emissions from getting the letter from your desk to wherever.
People that store their work in the cloud do contribute. A major data centre consumes about 30 GWh per year, and the UK has about 450 data centres. After all, all this rubbish we write and record has to be stored somewhere. That raises the question, how many data centres will have to be built? These centres are where the “cloud” resides, and if everyone is busy filling them up, what happens when it is no longer so easy to build more? How long can we continue recording everything?
How much has to be recorded for posterity? All those pointless Facebook posts that make pointless comments (rude or otherwise) or show a few emoticons. If they were deleted after a few weeks, would anyone notice? The problem then, of course, is, who decides? Notice the recent fuss about Trump not being allowed to tweet. In my opinion, if they had done that to him when he became President he would have been more effective but that is another matter. The problem is, when you appoint a “Great Deleter” you open up so many cans of worms it is not funny. Some of what we store will be of interest historically, perhaps especially Trump’s tweets. Right now photos recovered from long ago fascinate many of us. I know that I recently downloaded a whole lot of photos of the area where my mother grew up, and where, still a long time ago, I drove her back to have a look around. So for me, it was of interest to hear her say what was there, where, and now be able to see it. Quite simply, in two lifetimes everything has changed remarkably, and what was there is no longer, other than in memories, and memories die. Also, storing photos in data centres takes up much less space than storing hard copies. Of the hard copies left, many have been lost, but how much of what is stored digitally will be available in a hundred years?
Much of what is stored digitally may become unreadable. In the scientific community, for example, the Royal Society for Chemistry has noted that computations carried out in the last century often use code that nobody now understands. Some of us have computer files written many years ago, but unless they were updated and converted into new formats they are unreadable other than on an ancient computer. Back to electricity, either we can go into our shell and try to live like the Amish, do something about electricity generation, or be like politicians and make encouraging speeches and hope all gets well. Apparently, Facebook, Apple, Google and others have committed to using 100% renewable electricity (although when is another question) and Microsoft claims that by 2050 it will have removed all the carbon emissions it has ever produced. These are noble aspirations, but so far, according to Greenpeace, only about 20% of the electricity used by the world’s data centres is renewable. Further, the data centres run uniform power consumption over the entire time. Solar is of little use during the night, and wind power fails when the wind is not blowing. If we rely heavily on such renewables, what happens when there are blackouts? And, of course, there is the question of the non-renewable resources used to build the computers in the cloud. So no, I do not think anyone will be reading my blogs in a hundred years. However, we should make more effort to generate electricity more sustainably. Unless we solve the fusion problem, I favour the liquid salt thorium-type reactor.