We’re streaming more and more of the content that we watch – an Ofcom survey found that video-streaming services and other non-broadcast content were up 70 per cent more in 2020 compared to 2019. But what impact does this activity have on the environment? There’s no single answer to this question, but we can make a few assumptions and scribble on the back of an envelope to figure something out. (There has been some controversy about these kinds of numbers – here we’ll use the detailed estimates made by carbonbrief.org.)